Question

If the smooth muscle in the wall of an artery relaxes, the artery will a) vasoconstrict...

If the smooth muscle in the wall of an artery relaxes, the artery will

a) vasoconstrict

b) vasodilate

c) increase its resistance to blood flow

d) not change

Science   Anatomy-And-Physiology   
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Answer #1

Answer is B

smooth muscle contracts or relaxes to change both the volume of blood vessels and the local blood pressure, a mechanism that is responsible for the redistribution of the blood within the body to areas where it is needed (i.e. areas with temporarily enhanced oxygen consumption). Thus the main function of vascular smooth muscle tone is to regulate the caliber of the blood vessels in the body. Excessive vasoconstriction leads to high blood pressure, while excessive vasodilation as in shock leads to low blood pressure.

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