The process of decrease in any vessel diameter that occurs due to smooth muscle contraction is called:
a. vasodilation.
b. venodilation.
c. vasoconstriction.
d. venoconstriction.
e. None of the answers is correct.

c. vasoconstriction

Explanation:

Vasoconstriction is a process which involves the narrowing or tightening of blood vessels which becomes smaller when the smooth muscles of these vessels become contracted. The tightening or narrowing of the blood vessels results in an increase in resistance as blood pressure rises, which leads to the restriction of blood flow. Vasoconstriction is the opposite of vasodilation.

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c. live where it’s cold and icy