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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