The Smallest Diameter Blood Vessels Are

Question

The smallest diameter blood vessels are
A)arteries.
B)arterioles.
C)venules.
D)capillaries.
E)veins.

Accepted Answer

Capillaries are the smallest diameter blood vessels, where gas and nutrient exchange occurs between the blood and surrounding tissues. Arteries, arterioles, and veins have larger diameters and are responsible for transporting blood to and from the capillaries. Venules are slightly larger than capillaries, but still smaller than arterioles and veins.