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nmdcat.online July 28, 2026

A patient experiences slow, sustained contractions in the intestine that continue even during sleep. These contractions are produced by:

A. Skeletal muscle
B. Cardiac muscle
C. Smooth muscle
✓
D. Voluntary muscle fibers

📝 Explanation

Correct: Smooth muscle contracts slowly and involuntarily in the walls of internal organs. A & D: Skeletal muscle is voluntary. B: Cardiac muscle is limited to the heart. Concept: Physiological role of smooth muscle.

📖 Additional Information

  • Skeletal muscle
  • Cardiac muscle
  • Smooth muscle
  • Voluntary muscle fibers

Correct: Smooth muscle contracts slowly and involuntarily in the walls of internal organs. A & D: Skeletal muscle is voluntary. B: Cardiac muscle is limited to the heart. Concept: Physiological role of smooth muscle.

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