Select the Correct Statement About the Function of Myocardial Cells

question 9

Multiple Choice

Select the correct statement about the function of myocardial cells.

• A)Each cardiac muscle cell is innervated by a sympathetic nerve ending so that the nervous system can increase heart rate.
• 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)The influx of potassium ions from extracellular sources is the initiating event in cardiac muscle contraction.

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