Q: Vasoconstriction of a blood vessel would have which of the following affects at the site of constriction, assuming the volume of blood passing through does not change?
A		The velocity of the blood flow would increase.
B		The cross-sectional area of the vessel would increase.
C		Constriction involves muscle relaxation.
D		The rate of gas exchange in the region would increase.

Fluids | Circulatory System |