Question

What occurs during the refractory period of an action potential?

A. Hyperpolarization
B. Na+ deactivation open, Na+ and K+ activation closed
C. Na+ and K+ activation open, Na+ deactivation closed
D. Prevents backward propagation of Na+ and K+
E. Na+ activation closed, Na+ deactivation open, K+ activation open

Answer 1

The refractory period of an action potential is the period immediately following the transmission of an impulse in a nerve or muscle, during which the neuron or muscle regains its ability to transmit another impulse.

Step-by-step explanation:

The refractory period of an action potential is the period immediately following the transmission of an impulse in a nerve or muscle, during which the neuron or muscle regains its ability to transmit another impulse. During this period, the membrane is in a hyperpolarized state and cannot generate another action potential.

This is because the voltage-gated sodium channels are inactivated, preventing the backward propagation of sodium ions and potassium ions. The refractory period allows the voltage-sensitive ion channels to return to their resting configurations.