THORAX ABDOMEN AND PELVIS

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: -Each bronchi is divided into smaller branches called as the bronchioles. At the end of each bronchioles are the microscopic sacs called as the alveoli.

Detailed explanation-3: -The alveoli are located in the alveolar sacs of the lungs in the pulmonary lobules of the respiratory zone. They are more numerous in the blind-ended alveolar sacs. Respiratory bronchioles lead into alveolar ducts which are deeply lined with alveoli.

Detailed explanation-4: -Your bronchioles are some of the smallest airways in your lungs. Inhaled air passes through tiny ducts from the bronchioles into elastic air sacs (alveoli). The alveoli are surrounded by the alveolar-capillary membrane, which normally prevents liquid in the capillaries from entering the air sacs.