In Cardiac Muscle, the Fast Depolarization Phase of the Action

question 36

Multiple Choice

In cardiac muscle, the fast depolarization phase of the action potential is the result of

• A) increased membrane permeability to sodium ions.
• B) increased membrane permeability to chloride ions.
• C) decreased membrane permeability to calcium ions.
• D) decreased membrane permeability to sodium ions.
• E) increased membrane permeability to potassium ions.

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