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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.
Answer: Vasoconstriction is a reduction in the lumen diameter of a blood vessel due to smooth muscle contraction. Vasodilation is a widening of the lumen due to smooth muscle relaxation. Both are regulated by vasomotor nerve fibers of the sympathetic division of the autonomic nervous system.