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Questions and Answers
What does the Central Nervous System (CNS) consist of?
What does the Central Nervous System (CNS) consist of?
What does the Peripheral Nervous System (PNS) consist of?
What does the Peripheral Nervous System (PNS) consist of?
What are the four major parts of the brain?
What are the four major parts of the brain?
Cerebrum, Cerebellum, Brain Stem, and Diencephalon
What are the three functions of the nervous system?
What are the three functions of the nervous system?
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What is a Sensory Function (Afferent)?
What is a Sensory Function (Afferent)?
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What is an Integrative Function?
What is an Integrative Function?
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What is a Motor Function (Efferent)?
What is a Motor Function (Efferent)?
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What are the two types of cells in the nervous system?
What are the two types of cells in the nervous system?
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What are Neurons?
What are Neurons?
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What are Neuroglia (glial cells)?
What are Neuroglia (glial cells)?
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What are the parts of a Neuron?
What are the parts of a Neuron?
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What are Dendrites?
What are Dendrites?
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What is the Cell body?
What is the Cell body?
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What is a Ganglion (ganglia)?
What is a Ganglion (ganglia)?
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What does an Axon do?
What does an Axon do?
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What are Axon terminals (synaptic knobs)?
What are Axon terminals (synaptic knobs)?
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What is the Myelin sheath?
What is the Myelin sheath?
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What is the difference between Myelinated axon and Unmyelinated axon?
What is the difference between Myelinated axon and Unmyelinated axon?
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What is White matter?
What is White matter?
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What is Gray matter?
What is Gray matter?
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What are Interneurons?
What are Interneurons?
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What are the four types of cells in the CNS?
What are the four types of cells in the CNS?
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What are Astrocytes?
What are Astrocytes?
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What are Oligodendrocytes?
What are Oligodendrocytes?
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What are Ependymal cells?
What are Ependymal cells?
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What are Microglia?
What are Microglia?
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What are Satellite cells?
What are Satellite cells?
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What are Schwann cells?
What are Schwann cells?
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What are Nodes of Ranvier?
What are Nodes of Ranvier?
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What is the Blood brain barrier?
What is the Blood brain barrier?
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What are Nerve impulses?
What are Nerve impulses?
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What is an Action potential?
What is an Action potential?
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What is Potassium (K+)?
What is Potassium (K+)?
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What is Sodium (Na+)?
What is Sodium (Na+)?
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What is Polarization?
What is Polarization?
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What is Depolarization?
What is Depolarization?
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What is Repolarization?
What is Repolarization?
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What is the Refractory period?
What is the Refractory period?
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What is the All-or-nothing manner?
What is the All-or-nothing manner?
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What is Saltatory conduction?
What is Saltatory conduction?
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What is meant by Synapses across neurons?
What is meant by Synapses across neurons?
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What is the Synaptic cleft?
What is the Synaptic cleft?
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What are Neurotransmitters?
What are Neurotransmitters?
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What are Receptor sites?
What are Receptor sites?
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What are the events at the Synapsis?
What are the events at the Synapsis?
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Study Notes
Central Nervous System (CNS)
- Composed of the brain and spinal cord, which serve as the main control center for the body.
Peripheral Nervous System (PNS)
- Encompasses all nerves and receptors outside of the CNS, facilitating communication between the CNS and the rest of the body.
Major Parts of the Brain
- Four primary regions: Cerebrum, Cerebellum, Brain Stem, Diencephalon.
Functions of the Nervous System
- Sensory Function (Afferent): Transmits sensory information from PNS to CNS.
- Integrative Function: Involves processing and interpreting sensory input by the brain.
- Motor Function (Efferent): Carries motor commands from CNS to PNS to elicit responses.
Types of Nervous System Cells
- Neurons: Transmit nerve impulses; do not regenerate after injury.
- Neuroglia (Glial Cells): Provide support and nourishment to neurons; more numerous than neurons.
Neuron Structure
- Dendrites: Branch-like extensions that receive signals and direct them to the cell body.
- Cell Body: Contains the nucleus and DNA; crucial for neuron function.
- Ganglion (Ganglia): Clusters of nerve cell bodies in the PNS.
- Axon: Conducts impulses away from the cell body toward target structures.
- Axon Terminals (Synaptic Knobs): Release neurotransmitters to communicate with other neurons.
- Myelin Sheath: Insulating layer that enhances speed of impulse transmission.
- Schwann Cells: Form myelin sheath in the PNS.
- Nodes of Ranvier: Gaps in the myelin sheath where action potentials occur.
Myelination
- Myelinated Axons: Have a myelin cover, enabling faster impulse conduction.
- Unmyelinated Axons: Lack myelin, resulting in slower impulse transmission.
Nervous Tissue Types
- White Matter: Defined by myelinated axons, involved in the rapid transmission of signals.
- Gray Matter: Comprised of unmyelinated axons and cell bodies, involved in processing information.
Interneurons
- Responsible for transmitting signals between neurons, primarily within the CNS.
Types of Glial Cells in CNS
- Astrocytes: Maintain blood-brain barrier and support neurons.
- Oligodendrocytes: Produce myelin in the CNS, capable of myelinating multiple axons simultaneously.
- Ependymal Cells: Line brain cavities, their cilia help circulate cerebrospinal fluid.
- Microglia: Act as immune cells in the CNS, cleaning debris.
Satellite Cells
- Surround neuron cell bodies in PNS ganglia, regulating the chemical environment.
Nerve Impulse
- Electrical signal transmitted from one neuron to another; also termed action potential.
Action Potential Phases
- Polarization: Neuron's resting state with a more negative interior.
- Depolarization: Sodium ions influx into the neuron activates impulse.
- Repolarization: Following depolarization, potassium ions exit the neuron.
- Refractory Period: Period where second action potential cannot occur; ensures unidirectional signal transmission.
Saltatory Conduction
- Impulse jumps between Nodes of Ranvier, enhancing speed and efficiency of signal transmission.
Synapse and Communication
- Synaptic Cleft: The gap between two neurons, where neurotransmitters transmit signals.
- Neurotransmitters: Chemicals (like Acetylcholine and Norepinephrine) that relay messages across synapses.
- Receptor Sites: Specific sites on the receiving neuron that bind with neurotransmitters, initiating a response.
Events at Synapse
- Sequential process: nerve impulse travels to axon terminal, neurotransmitter release, binding to receptors, and transmission of signal to the next neuron.
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Description
Explore the essential components and functions of the nervous system in this quiz. You will learn about the central and peripheral nervous systems, major brain regions, and the types of cells involved. Test your knowledge on how these systems communicate and process information.