Myocardial Cells Exhibit a Plateau Phase Instead of Quickly Repolarizing

question 52

Multiple Choice

Myocardial cells exhibit a plateau phase instead of quickly repolarizing.This is due to

• A)inward diffusion of calcium through slow Ca²⁺ channels.
• B)inward diffusion of sodium through fast Na⁺ channels.
• C)inward diffusion of potassium through voltage-gated K⁺ channels.
• D)outward pumping of sodium by the Na⁺/K⁺ pump.

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