Smooth muscle in the arteriole walls can vasoconstrict or vasodilate, which:

A) helps to regulate blood pressure.
B) helps to accelerate the flow of blood through the vessels.
C) prevents the back flow of blood into the tissues.
D) squeezes oxygen out of the blood.
E) adds strength to the blood vessels.

Arteriole Walls

The thin-walled blood vessels that regulate blood flow from arteries to capillaries, majorly affecting blood pressure and flow.

Vasodilate

The process of widening blood vessels to increase blood flow.

Blood Pressure

The force exerted by circulating blood upon the walls of blood vessels, often measured for diagnosis since it is related to the heart's pump strength and the elasticity of the arteries.