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 (rising)
b) Repolarization (falling)
c) Hyperpolarization (refractory period)
d) Overshoot (peak)
e) A or B
f) None of the above

Answer 1

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

Step-by-step explanation:

Based on the information provided, the cell with a membrane potential of approximately -20 mV is in the depolarization phase of an action potential. Depolarization is the phase where the membrane potential becomes less negative and moves towards a positive value. This phase occurs when an external stimulus causes the opening of sodium (Na+) channels, resulting in an influx of Na+ ions into the cell, and causing the membrane potential to become less negative.

So, the correct answer is a) Depolarization (rising).