Why Can't Tetanus Occur in the Heart

question 87

Multiple Choice

Why can't tetanus occur in the heart?

• A)There are no distinct motor units in the heart.
• B)There is inadequate oxygen supply via the coronary circulation to metabolically support a sustained contraction.
• C)The refractory period in cardiac muscle lasts almost as long as the contraction.
• D)The heart contracts with maximal force every beat so it is impossible to increase the strength of its contraction.
• E)Vagal stimulation slows down the heart rate to prevent summation of contractions.

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