NEET PG DENTAL EXAM

Detailed explanation-1: -The alveoli have a very large total surface area and a very good blood supply, provided by the dense network of capillaries that surround them to exchange gases during the process of breathing in and breathing out.

Detailed explanation-2: -Capillaries are the blood vessels that reach out to small cells and tissue, helping in the exchange of materials like oxygen, carbon dioxide, and waste.

Detailed explanation-3: -The three types of methods for capillary exchange are diffusion, bulk flow, and transcytosis. Diffusion is the primary mechanism by which small molecules flow across capillaries and into the interstitial fluid, and vice versa, from the interstitial fluid into the capillaries.

Detailed explanation-4: -The dense networks of capillaries present a large surface area, which allows materials to be exchanged between body cells and the blood rapidly. Oxygen and dissolved foods diffuse into body cells from the blood, and carbon dioxide and other waste products diffuse out of body cells into the blood.