Which structures contain valves?
A) arteries and veins
B) arteries and heart
C) arteries, capillaries, and heart
D) lymph capillaries, arteries, and heart
E) lymph capillaries, veins, and heart

Question

Quizplus · Accepted Answer

Valves are found in veins, the heart, and lymph capillaries. In veins and lymph capillaries, valves prevent the backflow of blood and lymph, respectively. The heart contains valves to ensure unidirectional blood flow through its chambers. Arteries and capillaries do not have valves because the blood pressure is generally high enough to prevent backflow and their structure is not suited for valves.

Which Structures Contain Valves