PATHOLOGY

Detailed explanation-1: -The oxygen in inhaled air passes across the thin lining of the air sacs and into the blood vessels. This is known as diffusion. The oxygen in the blood is then carried around the body in the bloodstream, reaching every cell. When oxygen passes into the bloodstream, carbon dioxide leaves it.

Detailed explanation-2: -Blood Supply The lungs are supplied with blood by both pulmonary and bronchial circulation. The pulmonary circulation carries deoxygenated blood from the heart to the lungs and transports back oxygenated blood to the heart that can be supplied to the body.