THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Respiratory bronchioles lead into alveolar ducts which are deeply lined with alveoli. Each respiratory bronchiole gives rise to between two and eleven alveolar ducts. Each duct opens into five or six alveolar sacs into which clusters of alveoli open.

Detailed explanation-2: -Alveoli are the terminal pockets of the lungs where gas exchange occurs (within alveolar sacs). Alveolar ducts connect these small pockets to the bronchioles of the lungs.

Detailed explanation-3: -Each bronchiole divides into two or more respiratory bronchioles, with scattered alveoli, and each of these again divides into several alveolar ducts, with a greater number of alveoli connected with them.

Detailed explanation-4: -The alveolar ducts are numerous ducts in the respiratory system that connect the alveolar sacs to the bronchioles. The alveolar sacs are sacs of many alveoli, which are the cells that exchange oxygen and carbon dioxide in the lungs.