What term describes narrowing of venous blood vessel walls?

• A. Venodilate
• B. Vasodilate
• C. Vasoconstrict
• D. Venoconstrict

Answer: (D)

You’re being asked which term describes the narrowing of veins. Veins have smooth muscle in their walls, and when this muscle contracts, the diameter of the vein decreases. That specific action is venoconstriction, described by the verb venoconstrict. So the correct term fits precisely for veins becoming narrower. In contrast, venodilate means veins widening, vasodilate means widening of vessels in general, and vasoconstrict refers to constriction of vessels (often including arteries).