CRAT Practice Questions - Certified Rhythm Analysis Technician Exam

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Which phase of the cardiac action potential corresponds to the absolute refractory period when the cell cannot be re-stimulated regardless of stimulus strength?

Phase 0 (depolarization) through early phase 3 Phase 4 (resting) Late phase 3 only Phase 2 plateau alone

Correct Answer:

Phase 0 (depolarization) through early phase 3

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