An Action Potential Usually Goes Only in One Direction in an Axon

question 108

Multiple Choice

An action potential usually goes only in one direction in an axon because:

• A)the ions can flow only in one direction.
• B)the refractory periods force the impulse to go in one direction.
• C)the ion flow is attracted to chemicals in the synaptic knob.
• D)autoreceptors inhibit backward flow of ions.

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