APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -During gas exchange oxygen moves from the lungs to the bloodstream. At the same time carbon dioxide passes from the blood to the lungs. This happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.

Detailed explanation-2: -Capillaries-these are the sites of gas exchange between the tissues. Veins-these return “oxygen poor” blood to the heart, except for the vein that carries blood from the lungs.

Detailed explanation-3: -Oxygen passes quickly through this air-blood barrier into the blood in the capillaries. Similarly, carbon dioxide passes from the blood into the alveoli and is then exhaled.