An action potential begins with a
A)stimulus.
B)depolarization.
C)repolarization.
D)refractory period.

Question

Quizplus · Accepted Answer

An action potential begins with a stimulus, which could be a chemical, electrical or mechanical signal that opens ion channels in the neuron membrane and allows ions to flow into the cell. This initial depolarization triggers a chain reaction of voltage-gated ion channels opening and closing, leading to the propagation of the action potential down the neuron. Repolarization follows as the membrane potential returns to its resting state, and subsequently enters a refractory period during which another action potential cannot be generated.

An Action Potential Begins with a