Cardiac Muscle Differs from Both Smooth and Skeletal Muscle in That

question 2

Multiple Choice

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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