Question

You observe a cell with a membrane potential of approximately -20 mV. Which phase(s) of an action potential are potentially happening?

A) Depolarization
B) Repolarization
C) Undershoot
D) Overshoot
E) A or B
F) None of the above

Answer 1

The cell with a membrane potential of -20 mV is in the depolarization phase of an action potential.

Step-by-step explanation:

The cell with a membrane potential of -20 mV is in the depolarization phase of an action potential. During depolarization, the membrane potential becomes less negative as positively charged ions, such as sodium ions (Na+), flow into the cell. This leads to a rapid rise in membrane voltage until it reaches its peak positive value. Therefore, the answer is A) Depolarization.