Select the Correct Statement About the Function of Myocardial Cells

question 36

Multiple Choice

Select the correct statement about the function of myocardial cells.

• A) The influx of potassium ions from extracellular sources is the initiating event in cardiac muscle contraction.
• B) The refractory period in skeletal muscle is much longer than that in cardiac muscle.
• C) The entire heart contracts as a unit or it does not contract at all.
• D) Cardiac muscle cells are innervated by sympathetic, parasympathetic, and somatic nerve fibers so that the nervous system can increase heart rate.

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