Question 20 of 30 Points 3 All of the following are classification of blood vessels except A. Capilaries B. Arteries C. Veins D. Valve Clear selection

The correct answer is **D. Valve**.<br /><br />Valves are structures *within* the heart and veins that ensure one-way blood flow. They are not a classification of blood vessel themselves. Capillaries, arteries, and veins are the three types of blood vessels.<br />