Rapid depolarization (phase 0) of the action potential of ventricular muscle results from opening of:
Correct Answer: Voltage-gated Na+ channels
Description: Ans. B. Voltage-gated Na+ channelsVoltage-gated Na+ channels are responsible for phase 0 in ventricular muscle. Voltage gated Ca2+ channels are responsible for phase 0 in nodal cells. The potassium channels mentioned do not play a role in mediating depolarization.
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Physiology
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