Which Channel Is Responsible for Depolarization Phase of Action Potential

question 29

Multiple Choice

Which channel is responsible for depolarization phase of action potential in the contractile cardiac muscle fibers?

• A) opening of voltage gated Na⁺ channels
• B) closing of voltage gated Na⁺ channels
• C) opening of fast voltage gated K⁺ channels
• D) closing of slow voltage gated K⁺ channels

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