Vasoconstriction refers to a decrease in the radius of the vessel, which results in an increase in vascular resistance. It is usually due to the activation of the sympathetic nervous system. Therefore, options A and C are incorrect. Option D is not the best choice because it includes A, which is incorrect. Option E is also incorrect because it includes C, which is incorrect.

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Vasoconstriction

Question 9

Multiple Choice

Vasoconstriction

A) causes a decrease in resistance
B) refers to a decrease in the radius of a vessel
C) is due to a decrease in sympathetic activity
D) is both a and b
E) is both b and c

Correct Answer: