A decrease in the diameter of a blood vessel due to smooth muscle contraction is called:

A decrease in the diameter of a blood vessel due to smooth muscle contraction is called:

• A. Goniometry
• B. Ablation
• C. Artifact
• D. Vasoconstriction

Answer: (D)

When a blood vessel narrows because its smooth muscle contracts, the lumen gets smaller and blood flow is more restricted. This process is called vasoconstriction. It happens as the smooth muscle in the vessel wall tightens, often under sympathetic nerve influence or certain chemical signals, helping regulate blood pressure and distribution of blood to tissues. In contrast, the other terms describe something else: goniometry measures joint angles, ablation means removing or destroying tissue, and an artifact is an error or misleading feature in data.

When a blood vessel narrows because its smooth muscle contracts, the lumen gets smaller and blood flow is more restricted. This process is called vasoconstriction. It happens as the smooth muscle in the vessel wall tightens, often under sympathetic nerve influence or certain chemical signals, helping regulate blood pressure and distribution of blood to tissues. In contrast, the other terms describe something else: goniometry measures joint angles, ablation means removing or destroying tissue, and an artifact is an error or misleading feature in data.