A) resting potential and depolarization
B) depolarization and repolarization
C) action potential and depolarization
D) two cycles of impulse conduction.
Correct Answer: B
Solution :
: Refractory period is the interval during which muscle fibres fails to respond to a second stimulus. The refractory period is divided into an absolute refractory period, corresponding to the period from the time the firing level is reached until repolarization is about one-third complete, and a relative refractory period, lasting from this point to the start of after-depolarization.
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