ANATOMY

Detailed explanation-1: -Answer. Capillaries are vessels that are one cell thick and are responsible for exchange of nutrients and waste between the blood and cells.

Detailed explanation-2: -The main function of capillaries is to transport digested food, oxygen, and other materials to all the cells of the body. Hence, their walls are thin, so that the substances can get in and out of them easily by diffusion.

Detailed explanation-3: -Key Points. Capillaries measure 5-10 m in diameter and are only one cell thick. Capillaries connect arterioles and venules and enable the exchange of water, oxygen, carbon dioxide, and many other nutrients and waste substances between blood and surrounding tissues.

Detailed explanation-4: -The walls of capillaries are made up of a thin cell layer called endothelium that’s surrounded by another thin layer called a basement membrane.