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graph of membrane potential vs. time (ms) with points a, b, c, d
use the graph above to answer the next question.
during which indicated interval do potassium ions rapidly exit the axoplasm?
select one:
a. c
b. b
c. a
d. d

Explanation:

To determine when potassium ions rapidly exit the axoplasm, we analyze the action potential graph:

• Interval A: Resting potential (sodium - potassium pumps maintain it, no rapid K⁺ exit).
• Interval B: Depolarization (sodium ions rush in, not K⁺ exit).
• Interval C: Repolarization. After depolarization, voltage - gated potassium channels open, and potassium ions rapidly exit the axoplasm to restore the negative membrane potential.
• Interval D: Hyperpolarization (a brief over - shoot of K⁺ exit, but the rapid exit during repolarization is in interval C).

Answer:

a. C