psych ch 3

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Questions and Answers

What is the primary function of the myelin sheath in neurons?

To increase the speed of signal transmission (correct)

To facilitate neurotransmitter release

To reduce the size of the axon

To provide structural support to the neuron

What are the small gaps in the myelin sheath called?

Axon terminals

Nodes of Ranvier (correct)

Dendritic spines

Synaptic clefts

Which disorder is associated with reduced myelin and cognitive deficits?

Alzheimer's disease

Parkinson's disease

Phenylketonuria (PKU) (correct)

Multiple sclerosis

What happens in multiple sclerosis (MS)?

Loss of the myelin sheath Signup and view all the answers

What is the significance of the lock-and-key relationship between neurotransmitters and receptors?

Specific neurotransmitters bind to specific receptors Signup and view all the answers

What is released into the synaptic cleft during neuronal communication?

Neurotransmitters Signup and view all the answers

What symptoms may result from the loss of myelin sheath in multiple sclerosis?

Fatigue and loss of motor control Signup and view all the answers

What role do synaptic vesicles play in neuronal communication?

Releasing neurotransmitters into the synaptic cleft Signup and view all the answers

What is the primary function of the sympathetic division of the autonomic nervous system?

Prepare the body for fight or flight Signup and view all the answers

Which structure in the forebrain is primarily associated with emotion and memory?

Limbic system Signup and view all the answers

What is the role of the reticular formation found in the midbrain?

Influencing sleep and arousal Signup and view all the answers

What part of the brain is responsible for automatic functions like breathing and heart rate?

Hindbrain Signup and view all the answers

Which area of the brain helps with coordination of movement and certain types of memory?

Cerebellum Signup and view all the answers

What is the primary function of the corpus callosum?

To connect and enable communication between the two hemispheres Signup and view all the answers

In cases of severe epilepsy, what surgical procedure may be performed to control seizures?

Severing of the corpus callosum Signup and view all the answers

Which hemisphere is superior for pitch perception and negative emotions?

Right hemisphere Signup and view all the answers

What happens to split-brain patients when a picture is shown in the left visual field?

They cannot name the picture but can recreate it with their left hand Signup and view all the answers

Why is it suggested to think about the interaction of both hemispheres?

Because behaviors cannot be solely attributed to one hemisphere Signup and view all the answers

Which of the following is NOT a function associated with the left hemisphere?

Pitch perception Signup and view all the answers

How many axons are approximately in the corpus callosum?

200 million Signup and view all the answers

What effect does severing the corpus callosum have on patients?

Difficulties in verbal communication regarding visual stimuli Signup and view all the answers

What triggered Terri Schiavo's cardiac arrest?

A bulimic episode Signup and view all the answers

What condition did Terri Schiavo suffer from after her brain was deprived of oxygen?

Severe and permanent cerebral atrophy Signup and view all the answers

Why did Schiavo’s husband argue for the removal of her feeding tube?

He thought she wouldn't want to be kept alive without feelings Signup and view all the answers

What part of Schiavo’s brain was still intact and responsible for involuntary movements?

Brainstem Signup and view all the answers

How long did it take for the courts to rule in favor of Schiavo's husband?

12 years Signup and view all the answers

What was one possible reason for Schiavo's eye movements and groans?

They were involuntary responses from an intact brainstem Signup and view all the answers

How much were Terri Schiavo's medical costs estimated to be over the 15 years she was on a feeding tube?

$7 million Signup and view all the answers

What happened to a 13-year-old girl in 2013 after complications from tonsil surgery?

She was declared brain dead Signup and view all the answers

What primary role does the spinal cord serve in relation to the brain?

It connects the brain to the outside world and relays messages. Signup and view all the answers

Which process allows the spinal cord to respond to sensory messages without brain involvement?

Reflex action Signup and view all the answers

What is the significance of the way spinal cord segments are organized?

Segments connect to specific parts of the body through the peripheral nervous system. Signup and view all the answers

How does the spinal cord assist in survival during emergencies?

It initiates automatic reflexes that save seconds in response times. Signup and view all the answers

What happens to the lower segments of the spinal cord when an injury occurs in a specific segment?

Lower segments become cut off from the brain, leading to paralysis. Signup and view all the answers

Which statement about spinal reflexes is accurate?

They allow the body to rapidly react to certain stimuli. Signup and view all the answers

What protects the spinal cord from damage?

Bony vertebrae and cerebrospinal fluid. Signup and view all the answers

What is the primary control exerted by the brain stem?

Management of basic life processes such as breathing and digestion. Signup and view all the answers

Evolutionary psychology focuses on how universal patterns of behavior and cognitive processes have evolved over __________.

time Signup and view all the answers

Behavioral geneticists study how individual differences arise through the interaction of __________ and the environment.

genes Signup and view all the answers

Twin studies compare the likelihood that a given behavioral trait is shared among __________ and fraternal twins.

identical Signup and view all the answers

Both twin studies and adoption studies provide insight into the relative importance of __________ and environment.

genes Signup and view all the answers

Genetic variation, the genetic difference between individuals, contributes to a species’ __________ to its environment.

adaptation Signup and view all the answers

Each egg and sperm contain __________ chromosomes.

23 Signup and view all the answers

DNA is a helix-shaped molecule made up of __________ base pairs.

nucleotide Signup and view all the answers

A single gene may have multiple possible variations, known as __________.

alleles Signup and view all the answers

Genes are associated with temperament and a number of psychological disorders, such as ______ and schizophrenia.

depression Signup and view all the answers

Adoptees whose biological mothers had schizophrenia and who were raised in a disturbed family environment were much more likely to develop ______.

schizophrenia Signup and view all the answers

The study shows that adoptees with high genetic risk were most likely to develop schizophrenia if they were raised in ______ home environments.

disturbed Signup and view all the answers

The nervous system is composed of two basic cell types: glial cells and ______.

neurons Signup and view all the answers

Psychologists strive to understand the human mind by studying the ______ system.

nervous Signup and view all the answers

Both genetic vulnerability and environmental ______ are necessary for schizophrenia to develop.

stress Signup and view all the answers

Adoptees with a low genetic risk raised in disturbed family environments were likely to develop schizophrenia at ______%.

5.3 Signup and view all the answers

In a healthy family environment, only ______% of adoptees with high genetic risk were likely to develop schizophrenia.

5.8 Signup and view all the answers

The rod that caused damage to Gage's brain penetrated his ______.

skull Signup and view all the answers

Gage experienced difficulty controlling his emotional impulses due to damage in the frontal lobe and connections to the ______.

limbic system Signup and view all the answers

The somatosensory cortex, located in the parietal lobe, is essential for processing sensory information from the body's ______.

senses Signup and view all the answers

Each area of the somatosensory cortex processes sensations from a different part of the ______.

body Signup and view all the answers

The larger the surface area of a specific body part, the ______ the area dedicated to processing sensation from that body part in the somatosensory cortex.

larger Signup and view all the answers

Gage's case was significant in the 19th century debate over ______, which examined the association between brain areas and their functions.

localization Signup and view all the answers

Gage's prefrontal cortex sustained severe damage in the left ______.

hemisphere Signup and view all the answers

The amount of space allocated in the somatosensory cortex for fingers is much greater than that for ______.

toes Signup and view all the answers

Terri Schiavo went into cardiac arrest on February 25, 1990, apparently triggered by a ______ episode.

bulimic Signup and view all the answers

Schiavo was diagnosed with severe and permanent cerebral ______.

atrophy Signup and view all the answers

To remain alive, Schiavo required a feeding ______.

tube Signup and view all the answers

Schiavo’s husband argued that his wife would not have wanted to be kept alive with no ______, sensations, or brain activity.

feelings Signup and view all the answers

By 2005, the courts found in favor of Schiavo’s husband, and the feeding tube was removed on ______ 18, 2005.

March Signup and view all the answers

Despite her condition, Schiavo's ______ sometimes moved and she would occasionally groan.

eyes Signup and view all the answers

Schiavo's brainstem was still intact and responsible for involuntary movements of her ______ and the occasional groans.

eyes Signup and view all the answers

Over the 15-year period that she was on a feeding tube, Schiavo's medical costs may have topped ______ million.

7 Signup and view all the answers

SSRIs prevent the reuptake of ______ to strengthen its effect.

serotonin Signup and view all the answers

Common SSRIs include Prozac, Paxil, and ______.

Zoloft Signup and view all the answers

The drug ______ is structurally similar to serotonin.

LSD Signup and view all the answers

Psychotropic drugs often require ______ weeks to show improvement.

several Signup and view all the answers

The nervous system is divided into the central nervous system (CNS) and the ______.

peripheral nervous system (PNS) Signup and view all the answers

The peripheral nervous system includes the somatic and ______ nervous systems.

autonomic Signup and view all the answers

The peripheral nervous system is made up of thick bundles of ______ called nerves.

axons Signup and view all the answers

The CNS is comprised of the brain and ______.

spinal cord Signup and view all the answers

What do alleles represent in genetics?

Variations of a gene Signup and view all the answers

How does genetic variation primarily arise?

From interactions between genetics and the environment Signup and view all the answers

Which statement best describes the role of glial cells in the nervous system?

They insulate neurons and provide structural support Signup and view all the answers

What is one primary function of the nervous system?

To control internal stability and responses to external stimuli Signup and view all the answers

Why is understanding DNA important in psychology?

It helps to explain variations in cognition and behavior Signup and view all the answers

What best describes the function of receptors in the nervous system?

They detect changes and stimuli from the environment Signup and view all the answers

Which characteristic is NOT influenced by genetics?

Personal life experiences Signup and view all the answers

Which statement about the roles of genes in psychology is accurate?

Genes can influence both physical traits and psychological characteristics Signup and view all the answers

What primarily occurs when neurotransmitters bind to receptors on the dendrite of an adjacent neuron?

A nerve impulse is generated. Signup and view all the answers

Why is maintaining separate fluids inside and outside the neuron important?

It establishes the membrane potential for electrical signaling. Signup and view all the answers

How does alcohol affect neurotransmitter function?

It mimics neurotransmitters and blocks acetylcholine. Signup and view all the answers

What underlies the concept of a 'key and lock' analogy in neuronal communication?

Each neurotransmitter has a specific receptor it can bind to. Signup and view all the answers

What is the role of the sodium pump during resting potential in neurons?

It creates an electric charge across the cell membrane. Signup and view all the answers

What is a key effect of drugs on neurotransmitter activity?

They mimic or alter the release or uptake of neurotransmitters. Signup and view all the answers

What best describes the relationship between the brain and the peripheral nervous system?

The brain controls all bodily functions through the peripheral nervous system. Signup and view all the answers

What ensures that neurotransmitters effectively communicate messages between neurons?

The specificity of receptor binding. Signup and view all the answers

What is the role of the corpus callosum in the brain?

It connects the left and right hemispheres. Signup and view all the answers

Which division of the autonomic nervous system is primarily responsible for the body's stress response?

Sympathetic nervous system Signup and view all the answers

What part of the brain is involved in higher-level functions such as reasoning and language?

Cerebral cortex Signup and view all the answers

Which statement accurately describes the relationship between the brain's hemispheres?

Each hemisphere is responsible for different functions, with unique specializations. Signup and view all the answers

Which part of the brain is primarily responsible for processing audio and visual information?

Midbrain Signup and view all the answers

What function does the hindbrain serve in relation to the forebrain?

It acts as a relay between the forebrain and the spinal cord. Signup and view all the answers

Which part of the forebrain is mainly associated with intelligence and personality?

Cerebrum Signup and view all the answers

What can occur if the right hemisphere of the brain is damaged?

Deficits in creativity and non-verbal tasks Signup and view all the answers

What is the primary role of alleles in genetics?

They are alternate variations of a gene. Signup and view all the answers

What occurs when neurotransmitters are released into the synaptic cleft?

They bind to receptors on the adjacent neuron's dendrites. Signup and view all the answers

How does genetic variation contribute to cognitive and behavioral differences?

It affects adaptation and the success of traits in future generations. Signup and view all the answers

What is the primary role of the sodium pump in neurons?

To maintain resting potential by regulating ion concentrations. Signup and view all the answers

What function do glial cells serve in the nervous system?

They organize and support neurons. Signup and view all the answers

How do drugs affect neurotransmitter function?

They can imitate neurotransmitters and alter their release or binding ability. Signup and view all the answers

Why are genes significant in understanding personality traits?

They influence both physical and psychological characteristics. Signup and view all the answers

What effect does alcohol have on acetylcholine?

It blocks its function and impairs neural responses. Signup and view all the answers

In what way does the environment interact with genetic factors?

It influences the manifestation of genetic traits. Signup and view all the answers

What is the role of the nervous system in maintaining the body's function?

It controls responses to internal and external stimuli. Signup and view all the answers

What type of communication occurs within the nervous system?

Both electrical impulses and chemical signals. Signup and view all the answers

Which of the following describes the relationship between phenotypes and genotypes?

Genotypes determine the observable characteristics of phenotypes. Signup and view all the answers

What is the fluid environment of a neuron crucial for?

Maintaining membrane potential necessary for signaling. Signup and view all the answers

What analogy describes the specificity of neurotransmitter binding to receptors?

A lock and key. Signup and view all the answers

What characterizes the Minnesota twin studies in relation to genetics and psychology?

They explore the impact of genetic factors on psychological traits. Signup and view all the answers

What is the primary function of the spinal cord in relation to the brain?

To send and receive messages between the brain and body. Signup and view all the answers

What is the primary function of the somatic nervous system?

Controlling voluntary muscle movements Signup and view all the answers

Which part of the brain is primarily responsible for higher thinking and reasoning?

Cerebral cortex Signup and view all the answers

What role does the midbrain serve in the CNS?

Processing auditory and visual information Signup and view all the answers

Which division of the autonomic nervous system is primarily active during stress?

Sympathetic nervous system Signup and view all the answers

Which part of the brain connects the left and right hemispheres?

Corpus callosum Signup and view all the answers

What is a key function of the hindbrain?

Information transmission between the forebrain and spinal cord Signup and view all the answers

Damage to which hemisphere of the brain is likely to affect non-verbal abilities?

Right hemisphere Signup and view all the answers

Which statement best describes the structure of the cerebral cortex?

It has four distinct lobes. Signup and view all the answers

Study Notes

Myelin Sheath

Myelin sheath is a fatty substance that coats axons and acts as an insulator, increasing the speed of signal transmission.
Nodes of Ranvier are gaps in the myelin sheath.
Loss of myelin can impair neuronal function, leading to disorders like:
- PKU (Phenylketonuria): A genetic disorder causing reduced myelin and abnormalities in brain structures, resulting in cognitive deficits, exaggerated reflexes, and seizures.
- Multiple Sclerosis (MS): An autoimmune disorder characterized by widespread myelin loss. This disrupts electrical signal transmission, leading to symptoms like dizziness, fatigue, motor control issues, and sexual dysfunction.

Synaptic Transmission

Synaptic cleft is the small space between two neurons where communication occurs.
Neurotransmitters are chemicals released from the terminal buttons of one neuron into the synaptic cleft.
Receptors on the dendrite of the adjacent neuron bind to specific neurotransmitters, acting like a lock-and-key system.

The Spinal Cord

Spinal cord connects the brain to the body, acting as a relay station for messages.
It has its own system of automatic processes called reflexes.
The spinal cord is organized into 30 segments, each connected to a specific body part by the peripheral nervous system.
Sensory nerves bring information to the spinal cord, while motor nerves send information to muscles and organs.
Spinal reflexes allow for quick reactions without brain involvement, important for survival.
Spinal cord injuries can lead to paralysis, with lower segments being affected when damaged.

Brain Hemispheres

Left hemisphere excels in memory association, selective attention, and positive emotions.
Right hemisphere is superior in pitch perception, arousal, and negative emotions.
Corpus callosum connects the two hemispheres, enabling communication and information sharing.
Split-brain patients, with a severed corpus callosum, exhibit interesting behaviors:
- The right hemisphere's information is not accessible to the verbal left hemisphere, leading to inability to name objects seen in the left visual field.
- The right hemisphere controls the left hand, allowing split-brain patients to draw what they see in the left visual field, even though they cannot name it.

Brain Function and Disorders

Vegetative state occurs when the cerebral cortex ceases to function, while the brainstem remains intact.
Brainstem controls basic functions like breathing and involuntary movements.
Autonomic nervous system regulates organ and gland function, divided into:
- Sympathetic nervous system: Prepares the body for "fight or flight" responses.
- Parasympathetic nervous system: Manages normal function under relaxed conditions.

Brain Structures and their Functions

Cerebral cortex: The outer layer of the brain, composed of four lobes:
- Frontal lobe: Responsible for higher-level functions like planning, decision-making, and language.
- Parietal lobe: Processes sensory information, including touch, temperature, and pain.
- Temporal lobe: Deals with auditory processing, memory, and language comprehension.
- Occipital lobe: Responsible for visual processing.
Thalamus: Relays sensory information to the cerebral cortex.
Limbic system: Involved in emotional responses and memory formation.
Midbrain: Contains the reticular formation essential for sleep and arousal.
Substantia nigra and ventral tegmental area: Involved in movement, reward, and addiction.
Hindbrain: Controls basic life functions:
- Medulla: Regulates breathing, heart rate, and blood pressure.
- Pons: Controls sleep and arousal.
- Midbrain: Connects the forebrain and hindbrain.
- Cerebellum: Coordinates movement and certain types of memory.

Evolutionary Psychology

Focuses on how universal behavior patterns and cognitive processes evolved over time
Variations in cognition and behavior increase or decrease reproductive success and gene passing
Areas of study include:
- Fear response
- Food preferences
- Mate selection
- Cooperative behaviors

Behavioral Genetics

Studies individual differences in behavior arising from interactions between genetics and environment
Employs twin and adoption studies to research human behavior:
- Twin studies compare behavioral traits among identical and fraternal twins
- Adoption studies compare traits among biological relatives and adopted relatives
- Both approaches estimate relative importance of genes and environment for trait expression

Genetic Variation

Underlies adaptation to environmental pressures for species
Starts with fertilization of egg by sperm
Each egg and sperm contain 23 chromosomes
- Chromosomes are long strands of DNA
- DNA contains genes controlling traits like eye color and hair color
- Genes can have multiple versions (alleles) influencing temperament and disorders (e.g., depression, schizophrenia)

Gene-Environment Interactions

Illustrated by schizophrenia research showing:
- Adoptees with mothers having schizophrenia (high genetic risk) and raised in disturbed family environments were most prone to developing schizophrenia (36.8%)
- Adoptees with similar genetic risk but raised in nurturing environments had a much lower chance (5.8%)
- Adoptees with low genetic risk (mothers without schizophrenia) but raised in disturbed environments also showed a low chance (5.3%)
- Adoptees with low genetic risk and raised in nurturing environments showed a very low chance (4.8%)
This suggests both genetic vulnerability and environmental stress are necessary for developing schizophrenia, indicating that genes alone are insufficient

Neurons and Communication

Neurons are basic building blocks of nervous system
They communicate through electrical and chemical signals
Electrical signals transmit information within neurons
Chemical signals (neurotransmitters) carry information between neurons across the synapse
After release, neurotransmitters either are reabsorbed ("reuptake") or broken down
This process controls neurotransmitter function and signal strength
Antidepressants like SSRIs (selective serotonin reuptake inhibitors) target this process

Drugs as Agonists or Antagonists

Drugs act as agonists or antagonists for specific neurotransmitter systems
Agonists mimic neurotransmitter effects
Antagonists block neurotransmitter effects
Psychotropic drugs can take weeks for effects to appear
They have potential side effects and effectiveness varies

Central vs. Peripheral Nervous Systems

Nervous system is divided into:
- Central Nervous System (CNS): Brain and spinal cord
- Peripheral Nervous System (PNS): Connects CNS to the rest of the body

Somatic vs. Autonomic Nervous Systems

PNS further splits into:
- Somatic Nervous System: Controls voluntary movements (e.g., walking)
- Autonomic Nervous System: Regulates involuntary bodily functions (e.g., breathing, heart rate)

Sympathetic vs. Parasympathetic Systems

Autonomic Nervous System includes two branches:
- Sympathetic Nervous System: "Fight or Flight" response
- Parasympathetic Nervous System: "Rest and Digest" response

Phineas Gage Case

Illustrates importance of frontal lobe in decision-making and social behavior
Gage suffered severe frontal lobe damage resulting in personality and behavioral changes
He lost impulse control and social skills
His case contributed to understanding brain function and localization

Parietal Lobe and Somatosensory Cortex

Located behind frontal lobe
Processes sensory information from the body (touch, temperature, pain)
Contains the somatosensory cortex, mapping different body region sensations
Larger body surface areas and more nerve density lead to larger representation in the somatosensory cortex

Terri Schiavo Case

Involved a woman in a persistent vegetative state, prompting debate about end-of-life care
She had brain damage but retained functioning brainstem, enabling involuntary reflexes
Her case raised complex questions about life support and death, and the definition of brain death
Her medical expenses exceeded $7 million, highlighting societal costs

Brain Death

In 2013, a 13-year-old girl was declared brain dead after complications from tonsil surgery, leading to a conflict with her family over life support
This was a complex case that raised questions about brain death and its implications for medical decisions.

Genetics and Psychology

Genetics plays a vital role in understanding human behavior, physical characteristics and evolution.
Genotype refers to the genetic makeup of an individual, while phenotype refers to the observable characteristics.
Genetic variations arise from the differences in genes and their interaction with the environment.
These variations influence cognitive abilities and behaviors, leading to adaptation and survival.
DNA is the blueprint of life and contains the genetic code.
Genes are segments of DNA that control specific traits like eye and hair color, and height.
Alleles are alternate forms of a gene, contributing to variations in a trait.
The Minnesota twin studies showcase the influence of genetics on various aspects of human life.
Twin studies are essential for analyzing the relative roles of genetics and environment.

The Nervous System and Psychology

The nervous system is vital for controlling bodily functions through chemical and neural responses.
Receptors detect changes and stimuli, relaying information to the brain and spinal cord.
The nervous system consists of two primary types of cells: glia and neurons.
Glia provide support and insulation for neurons, enabling communication and organization.
Neurons are the building blocks of the nervous system, responsible for communication through electrical and chemical signals.

Neuron Communication

Neurons communicate through nerve impulses generated by changes in membrane permeability.
Dendrites receive information, which travels towards terminal buttons.
Synaptic vesicles release neurotransmitters into the synaptic cleft.
Neurotransmitters act as chemical messengers, binding with specific receptors on adjacent neurons.
The sodium-potassium pump maintains a difference in charge across the neuron membrane, creating a resting potential.

Neurotransmitters and Drugs

Drugs affect the nervous system by influencing the release, uptake, and binding of neurotransmitters.
Some drugs mimic neurotransmitters, binding to receptors and altering their functions.
Alcohol affects neurotransmitters like acetylcholine, GABA, serotonin, and glutamate.
Alcohol enhances GABA activity, slowing down neural responses and impairing coordination.

The Brain and Spinal Cord

The brain acts as the central control unit, managing all body functions.
The spinal cord connects the brain to the rest of the body, relaying messages.
The peripheral nervous system (PNS) carries information to and from the central nervous system (CNS).
The PNS is divided into the somatic (voluntary) and autonomic(involuntary) nervous systems.
The autonomic nervous system controls involuntary functions, further divided into the sympathetic and parasympathetic nervous systems.

The Sympathetic and Parasympathetic Nervous Systems

The sympathetic nervous system prepares the body for 'fight or flight' responses in stressful situations.
The parasympathetic nervous system promotes rest and relaxation.

Brain Structure and Function

The brain is divided into three main parts: the forebrain, midbrain, and hindbrain.
The forebrain, the largest part, contains the cerebrum, responsible for higher cognitive functions.
The cerebral cortex is responsible for intelligence, personality, reasoning, and language.
The cerebral cortex is divided into four lobes: frontal, parietal, temporal, and occipital.
The midbrain processes auditory and visual information.
The hindbrain relays information between the forebrain and spinal cord.

Corpus Callosum

The corpus callosum acts as the bridge between the two hemispheres of the brain, facilitating communication and coordination.

Genetics and Psychology

Genetics plays a vital role in understanding psychological characteristics and their development.
Genes are responsible for physical characteristics like eye and hair color, and height.
Genotype: Refers to an individual's genetic makeup.
Phenotype: Refers to the observable characteristics that are expressed based on the genotype.
Variation in genes leads to differences between individuals, including cognitive abilities and behaviors.
Allele: Alternate variations of a gene, leading to variations in phenotypes.
The Minnesota Twin Studies have been instrumental in understanding the influence of genetics on psychological traits.
DNA: Contains the genetic instructions for building and maintaining an organism.

The Nervous System and Psychology

The nervous system controls vital bodily functions.
Central Nervous System (CNS): Comprises the brain and spinal cord.
Peripheral Nervous System (PNS): Consists of nerve cells that connect the CNS to the rest of the body.
Neurons: Nerve cells responsible for transmitting information throughout the nervous system.
Glial Cells (Glia): Support neurons by providing insulation and structure.
Synaptic Vesicles: Contain neurotransmitters, which are chemical messengers released into the synaptic cleft.
Neurotransmitters: Molecules that transmit signals across synapses between neurons.
Synaptic Cleft: Space between neurons where neurotransmitters are released and interact with receptors.
Membrane Potential: Difference in electrical charge across the neuron's membrane, essential for transmitting signals.
Sodium-Potassium Pump: Maintains the membrane potential by actively transporting ions across the membrane.

The Brain and Spinal Cord

The Brain: Acts as a central processing unit, controlling all bodily functions.
The Spinal Cord: Serves as a connection between the brain and the rest of the body.
The Brain's Three Major Parts:
- Forebrain: Largest part, includes the cerebrum.
- Midbrain: Processes auditory and visual information.
- Hindbrain: Relays information between the forebrain and spinal cord.
Cerebrum: Responsible for higher cognitive functions, including reasoning, language, and personality.
Cerebral Cortex: Outer layer of the cerebrum, responsible for complex thought processes.
Corpus Callosum: A bundle of nerves that connects the two hemispheres of the brain, facilitating communication.

The Autonomic Nervous System

Controls involuntary bodily functions, such as heart rate, breathing, and digestion.
Sympathetic Nervous System: Prepares the body for "fight or flight" responses to stressful situations.
Parasympathetic Nervous System: Promotes relaxation and conserves energy.

The Impact of Drugs on the Nervous System

Drugs can affect the function of the nervous system by interfering with neurotransmitter activity.
They can:
- Alter the release or uptake of neurotransmitters.
- Mimic neurotransmitters and bind to receptors.
- Block the action of neurotransmitters.

Examples of Drug Effects

Alcohol:
- Binds to acetylcholine receptors, blocking its function.
- Enhances the activity of GABA, leading to slowed coordination.

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Description

This quiz explores key concepts in neuroscience, focusing on the myelin sheath and its role in neuronal function, including conditions like PKU and Multiple Sclerosis. It also covers synaptic transmission, detailing neurotransmitters and receptor function. Test your knowledge and understanding of these essential topics in neurobiology.