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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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Rapid depolarization (phase 0) of the action potential of ventricular muscle results from opening of:
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The correct answer is  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.