EVERYDAY SCIENCE

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 bronchi divide into smaller airways, called bronchioles, which end in clusters of tiny air sacs, called alveoli.

Detailed explanation-3: -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-4: -This exchange of oxygen and carbon dioxide is called respiration.

Detailed explanation-5: -The smallest airways, called bronchioles, lead to tiny air sacs called alveoli.