The capillaries are one celled blood vessels with no real walls. It is primarily used to diffuse nutrients and gas through. It is known to be the most functional unit of the blood vessels.
The wall of a capillary is extremely thin.
The capillary cell wall receives blood from the interstitial fluid.
Capillary walls receive oxygen in the lungs by a process known as diffusion.
Epithelial Tissues?
Capillary exchange play an important role in homeostasis, it involve the processes of that moves materials across typical capillary wall like diffusion, filtration and reabsorption.
Capillaries do not vary in thickness, they are very thin. The thin wall permits the exchange between the blood in the capillary and the adjacent tissue cells.
A capillary has a very narrow lumn and very thin wall. These features maximize diffusion of nutrients, wastes, and oxygen.
Slow flow speed in the capillary increases the efficiency of diffusion. In addition, the thin wall of the capillary helps substances to pass through efficiently.
Capillaries have very thin walls which are semi-permeable.
Villi
Diffusion
go look in your book punk