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nmdcat.online July 28, 2026

The observed experimental result of stimulating the vagus nerve (parasympathetic) in a laboratory animal would be a decrease in the activity of which muscle type?

A. Skeletal muscle of the legs
B. Smooth muscle of the intestines
C. Cardiac muscle of the heart
✓
D. Smooth muscle of the bronchioles

📝 Explanation

Parasympathetic stimulation via the vagus nerve releases acetylcholine, which binds to muscarinic receptors on the heart's pacemaker cells, slowing the heart rate (decreasing cardiac muscle activity). In contrast, it generally stimulates digestive smooth muscle.

📖 Additional Information

  • Skeletal muscle of the legs
  • Smooth muscle of the intestines
  • Cardiac muscle of the heart
  • Smooth muscle of the bronchioles

Parasympathetic stimulation via the vagus nerve releases acetylcholine, which binds to muscarinic receptors on the heart's pacemaker cells, slowing the heart rate (decreasing cardiac muscle activity). In contrast, it generally stimulates digestive smooth muscle.

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