Smooth muscle regulates which structures?

Smooth muscle regulates which structures?

• A. Blood vessels
• B. Bones
• C. Tendons
• D. Cartilage

Answer: (A)

Smooth muscle controls the diameter of hollow structures, especially blood vessels. The muscle layer in the walls of arteries and arterioles can contract or relax without conscious effort, causing vasoconstriction or vasodilation. This changes resistance and flow, helping regulate blood pressure and where blood is directed in the body. Bones, tendons, and cartilage aren’t regulated by smooth muscle; bones provide structure, tendons attach muscle to bone, and cartilage cushions joints—all governed by skeletal muscles and other tissues, not smooth muscle. In EMT contexts, remember that vascular smooth muscle tone directly influences perfusion and blood pressure.

Smooth muscle controls the diameter of hollow structures, especially blood vessels. The muscle layer in the walls of arteries and arterioles can contract or relax without conscious effort, causing vasoconstriction or vasodilation. This changes resistance and flow, helping regulate blood pressure and where blood is directed in the body. Bones, tendons, and cartilage aren’t regulated by smooth muscle; bones provide structure, tendons attach muscle to bone, and cartilage cushions joints—all governed by skeletal muscles and other tissues, not smooth muscle. In EMT contexts, remember that vascular smooth muscle tone directly influences perfusion and blood pressure.