Large Lymphatic Vessels Have a Wall Structure Most Similar to Which

Question

Large lymphatic vessels have a wall structure most similar to which blood vessel?
A) veins
B) venules
C) capillaries
D) arterioles
E) arteries

Accepted Answer

Large lymphatic vessels have a similar wall structure to veins. Both have three layers in their walls - an outer connective tissue layer, a middle smooth muscle layer, and an inner endothelial layer. However, lymphatic vessels have thinner walls than veins and lack valves, which are important in preventing backflow of blood.