Which Is Most Directly Responsible for the Falling (Repolarizing) Phase

question 57

Multiple Choice

Which is most directly 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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