The Period of Time Following an Action Potential During Which

Multiple Choice

The period of time following an action potential during which a membrane cannot be restimulated no matter how strong the stimulus

A) is known as the absolute refractory period.
B) occurs during the time after the Na+ gates have opened until they are restored to their "closed but capable of opening" conformation.
C) prevents the action potential from spreading back over the part of the membrane where the impulse has just passed.
D) two of these.
E) all of these answers.