Place the Five Phases of a Myocardial Action Potential in Correct

question 12

Multiple Choice

Place the five phases of a myocardial action potential in correct order.
1) Fast sodium channels are inactivated
2) Cell returns to its "resting" state
3) "Plateau" phase
4) Initial rapid depolarization of myocardial tissues
5) Calcium channels close

• A)1,3,2,5,4
• B)4,1,3,5,2
• C)1,2,3,4,5
• D)4,1,2,5,3

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