ANATOMY

Detailed explanation-1: -What are capillaries? Capillaries are delicate blood vessels that exist throughout your body. They transport blood, nutrients and oxygen to cells in your organs and body systems. Capillaries are the smallest blood vessels in your vascular system.

Detailed explanation-2: -The site of exchange of materials between blood and the surrounding cells is capillaries. Blood capillaries are the smallest vessels and are only one cell thick. Hence, exchange of materials can easily occur by diffusion across the membranes of blood capillaries.

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.

Detailed explanation-4: -Capillaries are the site at which exchange of oxygen, carbon dioxide and nutrients takes place. The structure of capillaries makes them very well suited for this function. As capillaries are only one cell thick and have very thin permeable walls this means that substances can diffuse out of them very easily.

Detailed explanation-5: -Exchange of material between the blood and surrounding cells takes place across the thin walls of capillaries.