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10 Cards in this Set

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  • Back
What is the difference between depolarization, and repolarization?
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.
Explain the All-or-None Theory.
The neuron either responds fully (threshold was reached) or not at all.
Which cells make up the myelin sheath?
Schwann Cells
All neural circut pathways must include what three things?
What does CNS stand for? What is its purpose?
-Central Nervous System
-Coordination and processing of all nerve impulses.
What is the neurilemma?
The delicate membrane that surrounds the axon of the nerve cells. It promotes the regeneration of damaged axons.
Identify three important differences between electrical current and nerve impulses.
-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.
Provide the definition of the word "Summation."
The sum effect of all neurotransmitters acting on a neuron.
Explain the functions of acetylcholine and cholinesterase.
Acetylcholine makes the postsynaptic membranes more permeable to Na+ ions. Cholinesterase breaks down acetylcholine.
What is the Synapse?
A space between a neuron's axon and its target. Also called synaptic cell.