The Rapid Depolarization Phase of the Action Potentials of Myocardial

question 60

Multiple Choice

The rapid depolarization phase of the action potentials of myocardial contractile cells is due to which ion(s) ?

• A) Ca²⁺ only
• B) K⁺ only
• C) Na⁺ only
• D) both Ca²⁺ and K⁺
• E) both Na⁺ and K⁺

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