ANATOMY

Detailed explanation-1: -Nutrients and waste exchange between the blood and body tissues occurs at the capillary bed. Venules are exit vessels in the capillary bed of various organs and unite to form veins, which return the blood to the heart. The arteriolar wall consists of three layers of cellular and extracellular components.

Detailed explanation-2: -Exchange of Gases, Nutrients, and Waste Between Blood and Tissue Occurs in the Capillaries. Capillaries are tiny vessels that branch out from arterioles to form networks around body cells.

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: -Capillary Exchange Mechanisms Diffusion, the most widely-used mechanism, allows the flow of small molecules across capillaries such as glucose and oxygen from the blood into the tissues and carbon dioxide from the tissue into the blood.