Select the correct answer for each question. Explain why you chose that answer as opposed to the others. In other words, explain why the other choices are incorrect.
Select the correct statement about the function of myocardial cells.
- Cardiac muscle cells are innervated by sympathetic, parasympathetic, and somatic nerve fibers so that the nervous system can increase heart rate.
- The refractory period in skeletal muscle is much longer than that in cardiac muscle.
- The influx of potassium ions from extracellular sources is the initiating event in cardiac muscle contraction.
- The entire heart contracts as a unit or it does not contract at all.
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