Lowered Extracellular Potassium Levels Will Lower the Heart Rate Because

question 107

Multiple Choice

Lowered extracellular potassium levels will lower the heart rate because

• A)the resting membrane potential is hyperpolarized.
• B)ectopic action potentials occur.
• C)action potential amplitude declines.
• D)more sodium channels open.
• E)it blocks calcium channels.

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