Refer to the following graph of an action potential to answer the question.

The membrane's permeability to sodium ions is greatest at label ________.
A) A
B) B
C) C
D) D

Question

Refer to the following graph of an action potential to answer the question.

The membrane's permeability to sodium ions is greatest at label ________.
A) A 
B) B 
C) C 
D) D

Quizplus · Accepted Answer

The graph represents the changes in membrane potential (mV) during an action potential. The highest point on the graph represents the peak of the action potential, which is when the membrane's permeability to sodium ions is at its greatest. This occurs at label B, when the membrane potential reaches about +30 mV.

Refer to the Following Graph of an Action Potential to Answer