Which of the Following Is Responsible for the Falling (Repolarizing)phase

question 126

Multiple Choice

Which of the following is responsible for the falling (repolarizing) phase of the action potential?

• A)Voltage-gated Na⁺ channels are opened
• B)The Na⁺, K⁺ pump restores the ions to their original locations inside and outside of the cell
• C)The permeability to Na⁺ increases greatly
• D)ATPase destroys the energy supply that was maintaining the action potential at its peak
• E)The permeability to K⁺ increases greatly while that to Na⁺ decreases

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