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nmdcat.online July 28, 2026

Which muscle type is primarily responsible for regulating the diameter of blood vessels?

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

📝 Explanation

Correct: Smooth muscle in blood vessel walls controls vasoconstriction and vasodilation. A: Skeletal muscle moves bones. C: Cardiac muscle forms the heart. D: Tendons connect muscles to bones. Concept: Function of smooth muscle.

📖 Additional Information

  • Skeletal muscle
  • Smooth muscle
  • Cardiac muscle
  • Tendon fibers

Correct: Smooth muscle in blood vessel walls controls vasoconstriction and vasodilation. A: Skeletal muscle moves bones. C: Cardiac muscle forms the heart. D: Tendons connect muscles to bones. Concept: Function of smooth muscle.

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