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Tetanic Muscle Contractions Don't Occur in a Normal Cardiac Muscle

Question 109

Multiple Choice

Tetanic muscle contractions don't occur in a normal cardiac muscle because


A) cardiac muscle tissue contracts on its own.
B) neural stimulation is lacking.
C) the refractory period lasts until the muscle relaxes.
D) the refractory period ends before the muscle reaches peak tension.
E) potassium channels outnumber sodium channels.

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