NEET PG DENTAL EXAM

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: -Complete answer: Air sacs are the internal compartment filled with air to facilitate internal air. Vertebrates have air sacs present in different body parts & perform various functions. Air sacs provide large surface area for gaseous exchange and increase the respiratory efficiency of the organism.

Detailed explanation-3: -Gas exchange in the alveoli occurs primarily by diffusion. Traveling from the alveoli to capillary blood, gases must pass through alveolar surfactant, alveolar epithelium, basement membrane, and capillary endothelium.

Detailed explanation-4: -Lung alveoli are found in the acini at the beginning of the respiratory zone. They are located sparsely in the respiratory bronchioles, lining the walls of the alveolar ducts. The alveoli are located in the alveolar sacs of the lungs in the pulmonary lobules of the respiratory zone.