MEDICAL PHYSIOLOGY

Detailed explanation-1: -Tiny air sacs at the end of the bronchioles (tiny branches of air tubes in the lungs). The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.

Detailed explanation-2: -Alveoli are the little sacs at the end of the bronchioles (Figure 1.2). They look like little bunches of grapes. Oxygen is exchanged for carbon dioxide in the alveoli. That means oxygen enters the blood, and carbon dioxide moves out of the blood.

Detailed explanation-3: -Lungs are divided into sacs to increase the surface area and to easily transport oxygen to the blood vessels which surrounds the air sacs and also air sacs have a thin film of oxygen which helps to absorb oxygen quickly.