Question

multiple choice question
what is a refractory period for a membrane?
o perod of time after an action potential when the membrane cannot send another action potential
o initial part of an action potential when sodium is rushing into the cell
o threshold potential needed to initiate an action potential.

Explanation:

The refractory period is a period where the membrane cannot generate another action potential immediately after one. The second option describes depolarization (sodium influx during action potential start), not refractory period. The third option is about threshold potential (stimulus needed to start action potential), not refractory period.

Answer:

Period of time after an action potential when the membrane cannot send another action potential.