The final repolarization phase of the action potential is
a. phase 1 . c. phase 3 .
b. phase 2 . d. phase 4 .
C
The final repolarization phase is phase 3 of the action potential. Phases 1 and 2 (partial repolarization) occur as the AP slope returns toward zero. The plateau that follows is described as phase 2 . In phase 4 the AP returns to an RMP of –80 to –90 mV.
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