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Sagot :
Increased sympathetic stimulation causes blood vessels to constrict, whereas decreased sympathetic stimulation causes blood vessels to vasodilate, in blood vessels that are only innervated by sympathetic axons.
Sympathetic stimulation of blood vessels causes arteries & arterioles (resistance vessels) to contract, increasing vascular resistance and reducing distal blood flow. The increasing vascular resistance that results from this across the body raises arterial pressure. When this happens, the sympathetic nervous system kicks in to assist you escape danger by increasing your heart rate, pumping more blood to regions of your body that need it, and other responses. Vasoconstriction that raises arterial blood pressure is caused by increased vascular sympathetic activity, which also increases the tone of the vascular smooth muscle. Vascular sympathetic activity is reduced, which causes the blood vessels to expand and lower blood pressure.
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