ANATOMY

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: -The alveoli form clusters, called alveolar sacs, that resemble bunches of grapes. By the same analogy, the alveolar ducts leading to the sacs are like the stems of individual grapes, but, unlike grapes, the alveolar sacs are pocketlike structures made up of several individual alveoli.

Detailed explanation-3: -Explanation: The spherical or grape-like shape of the alveoli allows for maximum contact between the alveoli and the capillaries that surround them.

Detailed explanation-4: -A pulmonary alveolus (plural: alveoli, from Latin alveolus, “little cavity"), also known as an air sac or air space, is one of millions of hollow, distensible cup-shaped cavities in the lungs where pulmonary gas exchange takes place.

Detailed explanation-5: -At the end of the bronchial tubes are air sacs called alveoli. The alveoli look like bunches of grapes but contain air. This is where the oxygen enters the blood and the carbon dioxide exits. There are about 300 million alveoli in each lung.