Which phases of the action potential represent the absolute refractory period?
I. Phase 0
II. Phase 1
III. Phase 2
IV. First half of Phase 3
V. First half of Phase 4
?
A. II, III, and IV only
B. I, II, and III only
C. IV and V only
D. I, II, III, and IV only
Answer: D
Health Professions
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