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10 Cards in this Set
- Front
- Back
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What is the difference between depolarization, and repolarization?
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Depolarization is caused by the diffusion of sodium ions into the nerve cell. Repolarization is a process in which the original polarity of the nerve membrane is restored.
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Explain the All-or-None Theory.
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The neuron either responds fully (threshold was reached) or not at all.
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Which cells make up the myelin sheath?
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Schwann Cells
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All neural circut pathways must include what three things?
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-reception
-transmission -processing |
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What does CNS stand for? What is its purpose?
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-Central Nervous System
-Coordination and processing of all nerve impulses. |
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What is the neurilemma?
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The delicate membrane that surrounds the axon of the nerve cells. It promotes the regeneration of damaged axons.
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Identify three important differences between electrical current and nerve impulses.
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-impulse does not diminish with length.
-neuron generates its own impulse. -electrical current is faster at 3x10^5km/s while nerve impulses are slower at 0.5-1.0m/s. |
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Provide the definition of the word "Summation."
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The sum effect of all neurotransmitters acting on a neuron.
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Explain the functions of acetylcholine and cholinesterase.
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Acetylcholine makes the postsynaptic membranes more permeable to Na+ ions. Cholinesterase breaks down acetylcholine.
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What is the Synapse?
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A space between a neuron's axon and its target. Also called synaptic cell.
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