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Vasoconstriction. One of the first effects is intense vasoconstriction of the skin vessels over the entire body. The posterior hypothalamus strongly activates the sympathetic nervous signals to the skin blood vessels, and intense vasoconstriction occurs throughout the body.
In essence, the process is the opposite of vasoconstriction, which is the narrowing of blood vessels. When blood vessels dilate, the flow of blood is increased due to a decrease in vascular resistance.n increase in either of these physiological components (cardiac output or TPR) causes a rise in the mean arterial pressure. Vasodilation works to decrease TPR and blood pressure through relaxation of smooth muscle cells in the tunica media layer of large arteries and smaller arterioles.