MEDICAL PHYSIOLOGY

Detailed explanation-1: -Vasoconstriction is the opposite of vasodilation. While vasodilation is the widening of your blood vessels, vasoconstriction is the narrowing of blood vessels. It’s due to a contraction of muscles in the blood vessels. When vasoconstriction occurs, the blood flow to some of your body’s tissues becomes restricted.

Detailed explanation-2: -Nervous stimulation and local chemical influences signal the smooth muscles of the arteriole wall. When the arterioles contract (vasoconstriction) the blood bypasses the tissues, and when they dilate (vasodilation) the blood flow in the local capillaries increases markedly.