Question

question 3
when repolarization of the cell membrane is complete, the:
a cell is no longer responsive
b original polarity of the cell is restored
c cell dies
d cell regenerates
e cell no longer has a potential difference across its membrane

Explanation:

Repolarization is the process of restoring the original polarity of the cell membrane after depolarization. During repolarization, potassium ions ($K^+$) move out of the cell, which helps in re - establishing the negative internal charge relative to the external environment.

• Option A: The cell is not non - responsive after repolarization. It can still be stimulated again after a short refractory period.
• Option B: Repolarization restores the original polarity (negative inside and positive outside in the resting state for many cells).
• Option C: Repolarization is a normal physiological process and does not lead to cell death.
• Option D: Repolarization is not related to cell regeneration. Cell regeneration is a different biological process involving cell growth and division.
• Option E: Even after repolarization, there is a potential difference (resting membrane potential) across the cell membrane.

Answer:

B. original polarity of the cell is restored