Neuroscience Basics Quiz
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Questions and Answers

Which part of a neuron is responsible for receiving signals from other neurons?

  • Axon
  • Synapse
  • Dendrites (correct)
  • Myelin sheath
  • What is the function of the myelin sheath?

  • To protect the neuron from damage
  • To increase the speed of signal transmission along the axon (correct)
  • To produce neurotransmitters
  • To transmit signals across the synapse
  • What is the gap between neurons called?

  • Axon
  • Synapse (correct)
  • Dendrite
  • Myelin sheath
  • What is the role of neurotransmitters in the transmission of signals between neurons?

    <p>To carry signals across the synaptic cleft (B)</p> Signup and view all the answers

    Which of the following is NOT part of a neuron?

    <p>Synaptic cleft (B)</p> Signup and view all the answers

    Which of these is directly related to the evolutionary theories of Darwin and Wallace?

    <p>The Materialist perspective (B)</p> Signup and view all the answers

    Which theory suggests that specific areas of the brain are responsible for different behaviors?

    <p>Gall's Localization of Function (B)</p> Signup and view all the answers

    What was Descartes's contribution to the understanding of the mind and body?

    <p>He suggested that the brain, particularly the pineal gland, is the bridge between the mind and body. (A)</p> Signup and view all the answers

    Which of the following is NOT a function of the brain?

    <p>Cell regeneration (A)</p> Signup and view all the answers

    Which of these is included in the Central Nervous System (CNS)?

    <p>Both A and B (C)</p> Signup and view all the answers

    What is the primary role of the Peripheral Nervous System (PNS)?

    <p>To connect the brain and spinal cord to the rest of the body (B)</p> Signup and view all the answers

    Which of these is NOT a function of the Cerebral Cortex?

    <p>Body temperature regulation (C)</p> Signup and view all the answers

    What is the main idea presented about the brain's role in the body?

    <p>The brain is an interconnected organ with distinct regions specialized for specific functions. (D)</p> Signup and view all the answers

    Which of these theories suggests that behavior can be fully understood by studying the nervous system?

    <p>Materialism (B)</p> Signup and view all the answers

    Which of these is NOT a part of the modern theories about behavior?

    <p>The soul governs behavior. (D)</p> Signup and view all the answers

    Which of the following statements is TRUE about the proportion of glial cells in the human brain?

    <p>Glial cells make up the majority of cells in the human brain. (C)</p> Signup and view all the answers

    What is the primary function of a sensory neuron?

    <p>To receive and transmit signals from the environment. (B)</p> Signup and view all the answers

    Which of the following characteristics is NOT shared by both motor and sensory neurons?

    <p>They are specialized at one end to respond to a particular stimulus. (C)</p> Signup and view all the answers

    Which area of the brain has the highest ratio of glial cells to neurons?

    <p>Telencephalon (A)</p> Signup and view all the answers

    What is a primary function of glial cells?

    <p>Supporting and protecting neurons. (A)</p> Signup and view all the answers

    What is the primary function of the endoplasmic reticulum in a neuron?

    <p>Transporting newly synthesized proteins. (C)</p> Signup and view all the answers

    According to the Neuron Theory, what is the fundamental unit of the nervous system?

    <p>Neurons (A)</p> Signup and view all the answers

    Which of the following structures is responsible for performing metabolic activities and providing energy for the cell?

    <p>Mitochondrion (C)</p> Signup and view all the answers

    What is the main difference between the views of Santiago Ramón y Cajal and Camillo Golgi regarding the nervous system?

    <p>Golgi believed in the continuous nature of neurons, while Cajal believed in their discrete nature. (C)</p> Signup and view all the answers

    Which of these is NOT a structural component of a neuron as described in the given text?

    <p>Golgi apparatus (B)</p> Signup and view all the answers

    What is the significance of the membrane surrounding a neuron?

    <p>It allows for the exchange of materials between the neuron and its environment. (B)</p> Signup and view all the answers

    Which cellular structure is primarily responsible for synthesizing new protein molecules in a neuron?

    <p>Ribosomes (B)</p> Signup and view all the answers

    What is the primary function of the nucleus within a neuron?

    <p>Storing genetic information (B)</p> Signup and view all the answers

    What is the purpose of the myelin sheath?

    <p>All of the above. (D)</p> Signup and view all the answers

    Which part of the neuron receives signals from other neurons?

    <p>Dendrites (A)</p> Signup and view all the answers

    What is the main function of the brain stem?

    <p>To regulate heartbeat, breathing, and sleep cycles. (C)</p> Signup and view all the answers

    What happens when a signal reaches the end of the axon?

    <p>The signal is transmitted to another neuron via a chemical synapse. (B)</p> Signup and view all the answers

    What is the role of the cerebellum in the nervous system?

    <p>It plays a crucial role in coordinating movements, balance, and coordination. (A)</p> Signup and view all the answers

    What is the function of the callosum?

    <p>It connects the right and left hemispheres of the brain. (B)</p> Signup and view all the answers

    How do neurons communicate with each other?

    <p>Through a combination of electrical and chemical signals. (A)</p> Signup and view all the answers

    What is the main focus of Biological Psychology, as described in the provided excerpt?

    <p>Examining the biological mechanisms that underlie both normal and abnormal behavior. (A)</p> Signup and view all the answers

    What is the key difference between Biological Psychology and traditional psychology, as highlighted in the excerpt?

    <p>Biological Psychology focuses on the 'hardware' that underlies cognition, while traditional psychology focuses on the 'software.' (A)</p> Signup and view all the answers

    What is the main concept addressed by the 'Mind-Body Problem,' as presented in the excerpt?

    <p>The philosophical question of how a non-physical mind can influence a physical body. (D)</p> Signup and view all the answers

    Why is the myth of Psyche and Cupid mentioned in the context of the Mind-Body Problem?

    <p>It highlights the ancient Greek belief that the mind was separate from the body. (D)</p> Signup and view all the answers

    What is the 'mentalism' theory as discussed in the excerpt?

    <p>The view that mental states directly cause physical actions. (C)</p> Signup and view all the answers

    What is Aristotle's theory regarding the relationship between the mind and the body?

    <p>The mind controls the body through the heart, responsible for life. (A)</p> Signup and view all the answers

    What is the significance of the statement "every observable action and higher cognitive function has an observable underlying biological cause" in the context of Biological Psychology?

    <p>It proposes that all behavior can be explained through biological mechanisms. (D)</p> Signup and view all the answers

    What is the main takeaway from the "Mind-Body Problem" as presented in the excerpt?

    <p>The relationship between the mind and the body is still a complex and challenging area of study. (D)</p> Signup and view all the answers

    Flashcards

    Biological Psychology

    Study of physiological, evolutionary, and developmental mechanisms of behavior.

    Mind-Body Problem

    The question of how a non-material mind interacts with the material body.

    Mentalism

    The belief that the psyche/mind is responsible for behavior and emotions.

    Psyche

    Term used by Aristotle to describe the mind or soul responsible for life.

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    Aristotle's view on movement

    Aristotle believed the mind produced movement via the heart.

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    Cognition

    Higher mental processes like thinking, knowing, and remembering.

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    Behavior

    Observable actions of individuals influenced by biological factors.

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    Evolutionary mechanisms

    Biological processes that contribute to changes in species over time affecting behavior.

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    Corpus Callosum

    Connects the brain's right and left hemispheres, facilitating communication between them.

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    Brain Stem

    Regulates vital functions such as heart rate, breathing, sleep cycles, and emotions.

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    Cerebellum

    Responsible for coordination, precision, and timing of movement.

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    Neurones

    Cells of the nervous system that transmit information throughout the body.

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    Dendrites

    Branch-like structures that receive signals from other neurons.

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    Axon

    Long part of a neurone that carries impulses away from the cell body to other cells.

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    Myelin Sheath

    Insulating layer around axons that speeds up signal transmission.

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    Electrochemical Signals

    The method by which neurons communicate, using both electrical and chemical processes.

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    Motor Neuron

    A neuron with its soma in the spinal cord that conducts impulses to muscles.

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    Sensory Neuron

    A neuron specialized to detect specific types of stimuli like touch or sound.

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    Glial Cells

    Supportive cells in the brain that outnumber neurons nearly 1:1.

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    Neuron to Glia Ratio

    In the human brain, the ratio is approximately 1:1, with about 86 billion neurons and 85 billion glial cells.

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    Variation of Glial Cells

    Glial cell proportions vary across brain regions, e.g., 3.8 glia per neuron in telencephalon.

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    Cell Body

    The part of a neuron that contains the nucleus and organelles.

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    Synapse

    The junction between two neurons where signals are transmitted.

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    Neurotransmitter

    Chemicals that transmit signals across the synapse to another neuron.

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    Dualism

    The belief that behavior is controlled by both mind and body.

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    Pineal Gland

    The brain structure Descartes associated with connecting mind and body.

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    Materialism

    The view that behavior can be explained solely by the nervous system's functions.

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    Localization of Function

    The theory that specific brain areas control specific behaviors.

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    Central Nervous System (CNS)

    The part of the nervous system that includes the brain and spinal cord.

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    Peripheral Nervous System (PNS)

    The system that connects the CNS to the rest of the body.

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    Cerebral Cortex

    The outer layer of the brain responsible for complex functions like reasoning and language.

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    Functions of the Brain

    Includes interpreting sensory information, and managing thoughts, emotions, and memory.

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    Phrenology

    The study that linked skull shape to mental faculties and personality traits.

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    Santiago Ramón y Cajal

    A Spanish investigator who pioneered neuroscience by showing neurons are separate entities.

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    Neuron Theory

    The theory that neurons are the functional units of the nervous system.

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    Neuron structure

    Neurons have a distinctive shape, allowing them to communicate effectively in the nervous system.

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    Cell Membrane

    A structure that separates the inside of the cell from the outside environment.

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    Nucleus

    The part of the cell that contains chromosomes and genetic material.

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    Mitochondria

    Cell structures that perform metabolic activities and provide energy.

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    Ribosomes

    Sites where the cell synthesizes new protein molecules.

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    Endoplasmic Reticulum

    A network of tubes that transports newly synthesized proteins within the cell.

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    Study Notes

    Biological Psychology 1: Introduction

    • Course code: PSY1617
    • Lecturer: Dr Massimo Pierucci
    • University: University of Malta
    • Required text: Kalat James W., Biological Psychology, 12th Edition, International Edition, Wadsworth, Cengage Learning.
    • Further reading options include: An introduction to brain and behavior, Fundamentals of Human Neuropsychology, Neurobiology, Molecules, Cells and Systems, Principles of Neural Sciences.

    Biological Psychology: Definitions

    • Study of physiological, evolutionary, and developmental mechanisms of behavior and experience.
    • Study of biological mechanisms of normal and abnormal behaviors (both brain and body).
    • Not interested in the human mind and its functions using a "black box" perspective.
    • Focuses on the hardware implementing cognition and behavior.
    • Goal is to link biology to psychology by understanding the correlation between brain functions and behavior, where every observable action/cognitive function has a corresponding biological cause.

    Mind-Body Problem

    • Hypothesis that the mind controls behavior started around 2000 years ago with Greek-Roman mythology (Psyche and Cupid).
    • Aristotle linked behavior to a person's psyche (not the brain); this view was responsible for behavior/emotions.
    • Mentalism: Mind (psyche) is linked to behavior/emotions.
    • The mind, a non-material entity, influences body movements.

    Modern Theories

    • Materialism: Behavior is explained solely by the nervous system, without needing to consider a non-material mind.
    • Gall's Localization of Function: Specific brain areas control distinct behaviors or traits.
    • Phrenology (Cranioscopy): Studying the skull's bumps to assess personality and mental abilities (considered pseudoscience today).

    Brain and Neuron Theories

    • Structure of brain with three regions: Reptilian brain (instincts and urges), Limbic brain (emotions and motivation), and the Neo-cortex (decision making).
    • This is a simplified model illustrating the interconnectedness of these regions.

    Nervous System

    • The nervous system is divided into the central nervous system (CNS), which includes the brain and spinal cord, and the peripheral nervous system (PNS), which connects everything to the brain and spinal cord.
    • The CNS is divided into the somatic and autonomic nervous systems.
    • The somatic nervous system is further divided into cranial and spinal nerves.
    • The autonomic nervous system comprises the sympathetic and parasympathetic divisions.

    The Brain

    • Interprets sensory information, monitors and regulates body functions, and is responsible for thinking, learning, memory, and emotions.
    • Different brain regions have specific functions.
    • The corpus callosum connects the brain's right and left hemispheres.
    • Brain stem regulates heart rate, breathing, sleep cycles, and emotions.
    • Cerebral cortex for planning, reasoning, language, and recognizing sounds/images/memory.
    • Cerebellum coordinates , precision, and timing of movements.

    Neurons

    • The basic units of the nervous system; they communicate through electrical and chemical signals.
    • Structures include: dendrites, cell body, axon, myelin sheath, nerve endings.
    • Electrical signals travel down the axon until reaching the nerve endings.
    • Neurons communicate with each other through synapses.
    • Signals cross between neurons at the synapse; the signal is transmitted to another neuron across a junction called a synapse by neurotransmitters.
    • Electrical impulse at the synapses: vesicles (carrying signals) fuse into the membrane; nerves end release neurotransmitter into the synaptic cleft; neurotransmitter diffuses across the cleft; receptors receive transmitters; Once enough receptors have transmitters, the signal is transmitted.

    Neuromuscular Junction (NMJ)

    • The point where the nervous system meets the muscles; it's where the nerve impulse causes muscle contraction.

    Action Potential

    • Hodgkin and Huxley's 1939 research on squid giant axons recorded for the first time the action potential and the propagation of electrical signals.

    The Cells of the Nervous System

    • Mental experiences depend on the activity of many separate but interconnected cells.
    • Understanding these interconnected cells helps understand how the nervous system works.

    Neurons and Glia

    • The nervous system consists of neurons and glial cells.
    • Neurons transmit electrical impulses, while glial cells insulate, support, and nourish neurons.
    • The human brain has approximately 100 billion neurons.

    How Many Neurons?

    • Cerebral cortex (and related areas): 12-15 billion neurons.
    • Spinal cord: 1 billion neurons.
    • Cerebellum: 70 billion neurons

    Santiago Ramón y Cajal (Pioneer of Neuroscience)

    • Demonstrated that nervous system cells remain separate, not merged as previously believed .
    • Described neuron theory whereby neurons are functional units.

    The Structures of an Animal Cell (Part 1)

    • Neurons contain the same fundamental structures as other body cells, including the membrane, nucleus, mitochondria, ribosomes, and endoplasmic reticulum.

    Structures of an Animal Cell (Part 2)

    • Membrane separates the inside of the cell from the outside environment.
    • Nucleus contains the chromosomes.
    • Mitochondria perform metabolic activities and supply energy to the cells.

    Structures of an Animal Cell (Part 3)

    • Ribosomes synthesize proteins.
    • Endoplasmic reticulum transports newly synthesized proteins.

    The Structure of a Neuron

    • Similar to other cells but with a unique structural shape.
    • Structural and functional unit of the nervous system.
    • Polarized: receiving and sending signals.
    • Complex intracellular machinery is needed to support function.
    • Lasts a lifetime, doesn't undergo mitosis (except in embryonic stages).
    • Requires a large amount of oxygen and glucose.
    • Specialized cytoskeleton determines the shape.

    Components of Neurons

    • Dendrites: collect information from other neurons.
    • Soma/cell body: integrates information from dendrites, processes it in the cell body, and then passes it to the axon.
    • Axon: carries the processed information.
    • Presynaptic terminals: release chemicals to communicate with other neurons.

    Dendrites

    • Branching fibers with synaptic receptors for incoming information.
    • Dendritic spines increase surface area, enabling a neuron to receive more information.

    Synapses/Dendritic Spines

    • Number of synapses/dendritic spines change during development, sensory stimulation, and experience.

    Cell Body/Soma

    • Contains the nucleus, mitochondria, and ribosomes.
    • Responsible for the neuron's metabolic work.
    • Covered with synapses in many neurons.

    Axons

    • Thin fibers that transmit nerve impulses.
    • May have a myelin sheath (insulation) with interruptions called nodes of Ranvier.
    • Presynaptic terminals at axon ends release chemicals to communicate with other neurons.

    Afferent, Efferent, and Intrinsic Neurons

    • Afferent axon: brings information into a structure.
    • Efferent axon: carries information away from a structure.
    • Interneurons/Intrinsic neurons: dendrites and axons entirely within a single structure.

    Variations Among Neurons

    • Neurons vary in size, shape, and function.
    • A neuron's shape determines its connections and contribution to the nervous system.
    • Example: Purkinje cells in the cerebellum have extensively branching shapes.

    Motor and Sensory Neurons

    • Motor neuron: soma in spinal cord, receives excitation, transmits impulses to muscles.
    • Sensory neuron: specialized end (sensitive to stimulation such as touch, light, sound).

    The Glial Cells

    • Supporting cells that insulate and nourish neurons, maintaining structural integrity.
    • Examples: Oligodendrocytes (CNS), Schwann cells (PNS), Astrocytes, Microglia, Ependymal cells.

    The proportion of glial cells varies across regions

    • The ratio of glial cells to neurons varies; in the telencephalon, it's about 3.8 to 1, and in the cerebellum, 0.2 to 1.

    Types of Glia

    • Astrocytes: help synchronize axons by wrapping around presynaptic terminals, taking up chemicals, and regulating blood flow.
    • Microglia: remove waste material, viruses, and fungi.

    Glial Cells (Part 2)

    • Oligodendrocytes (CNS)/Schwann cells (PNS): build myelin sheaths around neurons.
    • Radial glia: guide neuron migration and growth.

    Glial Cells (Part 3)

    • Most radial glia differentiate into neurons, astrocytes, and oligodendrocytes after embryonic development concludes.

    Shapes of Glial Cells

    • Distinct shapes and appearances; their structure is closely linked to their functions.

    Ependymal Cells

    • Specialized cells in the ventricles; responsible for making CSF.

    Astrocytes: Further details

    • Highly branched; forms network through gap junctions
    • When associated with synapse, take up and release chemicals (neurotransmitters), provide structural support, creating a framework/scaffolding for neurons, and are in contact with blood vessels.
    • Form blood-brain barrier and regulate exchange of materials to maintain and support brain activities
    • Increase supply of oxygen (O2) and glucose by triggering vessels dilation.
    • Healing: scar tissues are formed to seal off damaged regions.

    Blood-Brain Barrier

    • Isolates brain from the body's interstitial fluid; protects the brain from harmful substances.
    • Tight junctions in endothelial cells selectively allow specific substances to pass.
    • Drugs, toxins, viruses, pathogens are blocked by the barrier.
    • The permeability of the blood-brain barrier is weaker in specific brain regions, such as the hypothalamus and the medulla.

    Active Transport

    • Energy is needed to pump chemicals from the bloodstream into the brain.
    • Essential for delivering nutrients (glucose, hormones, amino acids, vitamins) to the brain.

    Nourishment of Vertebrate Neurons

    • Neurons rely heavily on glucose.
    • Brains require a high amount of oxygen (20% of the body's total oxygen consumption).

    Nourishment of Vertebrate Neurons (Part 2)

    • Thiamine (vitamin B₁) is needed to use glucose efficiently, deficiency leads to neuron damage (Korsakoff's syndrome).

    How the Blood-Brain Barrier Works

    • Illustrates how different types of molecules pass through the blood-brain barrier, regulating entry and exit, based on factors such as lipid solubility or active transport.

    Schwann cells and Oligodendrocytes

    • Myelin-producing glial cells; wrap around axons, increasing conduction velocity.
    • Difference between oligodendrocytes in the central nervous system and schwann cells in the peripheral nervous system lies in how they insulate axons.

    The Myelin Sheath

    • Fatty substance wrapping around axons.

    Myelin Speeds Up Neuron Signal Transmission

    • Myelin sheath is an essential component for improving the speed at which neurons transfer signals via saltatory conduction.

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    Test your knowledge of key concepts in neuroscience with this quiz. Questions cover neuron structure, brain functions, and historical contributions to our understanding of the mind and body. Challenge yourself to see how well you know the fundamentals of the nervous system!

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