PATHOLOGY

Detailed explanation-1: -Walls of capillaries are made up of a thin layer cell called endothelium surrounded by basement membrane. Exchange of material such as oxygen, nutrients and other waste between blood and tissue occur in capillaries. So the primary function of capillaries is to exchange the material to other body parts.

Detailed explanation-2: -Capillaries connect arteries to veins and are the main sites of nutrient/waste exchange. Capillaries have the largest total cross-sectional and surface area. Veins are thin-walled blood vessels that return deoxygenated blood to the heart.

Detailed explanation-3: -Capillaries are where fluids, gasses, nutrients, and wastes are exchanged between the blood and body tissues by diffusion. Capillary walls contain small pores that allow certain substances to pass into and out of the blood vessel.