MEDICAL
HEART AND PERICARDIUM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which event in a cardiac muscle cell’s action potential lasts about 75 msec and ends with closure of potassium channels?
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Repolarization
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Plateau
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Hyperpolarization
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Rapid depolarization
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Explanation:
Detailed explanation-1: -As a result, phase zero is followed by phase three. Phase three is repolarization, involving the closing of Ca2+ channels, blocking the flow of Ca2+ ions. Voltage-gated K+ channels open, allowing for efflux of K+ ions. This efflux of cation contributes to a rapid decrease of membrane potential from +10 mV to-60mV.
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