Cardiac muscle differs from both smooth and skeletal muscle in that A) its actin and myosin show no repeating pattern of arrangement when viewed under a microscope. B) neighboring cells in cardiac muscle are electrically coupled by gap junctions. C) its contractions are not explained by the sliding filament theory of muscular contraction. D) contractions of cardiac muscle are not due to Ca²⁺ influx into the sarcoplasm. E) its cells are multinucleated.

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Quizplus · Accepted Answer

Unlike smooth and skeletal muscle, neighboring cells in cardiac muscle are electrically coupled by gap junctions, allowing for rapid and synchronized contractions.

Cardiac Muscle Differs from Both Smooth and Skeletal Muscle in That