When the membrane potential is +15 mV, that portion of the membrane A) is in the normal resting state B) has a more positive outside border C) is more permeable to Ca²⁺ than normal D) is in the after hyperpolarization phase of an action potential E) has a more positive outside border and is more permeable to Ca²⁺ than normal

Question

Quizplus · Accepted Answer

When the membrane potential is +15 mV, it means that the inside of the cell is more negative than the outside, and therefore, the outside border is more positive. This is not indicative of any specific phase of an action potential or a change in ion permeability.

When the Membrane Potential Is +15 MV, That Portion of the Membrane