Which of the Following Statements About the Absolute Refractory Period

question 49

Multiple Choice

Which of the following statements about the absolute refractory period of cardiac muscle cells is TRUE?

• A) It lasts for the same length of time in cardiac muscle cells as it does in skeletal muscle cells.
• B) It is much longer than the refractory period of skeletal muscle cells.
• C) It allows for tetanic contractions of the heart to occur to assure smooth, coordinated ejection of blood from the ventricles.
• D) Ventricular muscle cells are in the absolute refractory period from the beginning of contraction until the beginning of their next contraction.
• E) During the absolute refractory period, a larger-than-normal stimulus will result in a premature ventricular contraction.

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