SECTIONS OF THE BRONCHIAL TREE THAT DO NOT CONTAIN CARTILAGE IN THEIR WALLS 1) ductuli alveolares 2) alveoli pulmonis 3) bronchiola respiratoria 4) bronchiola terminalis square

The correct answer is 2) alveoli pulmonis.<br /><br />Alveoli pulmonis, or pulmonary alveoli, are the tiny air sacs in the lungs where gas exchange occurs. They do not contain cartilage in their walls. The other options, ductuli alveolares, bronchiola respiratoria, and bronchiola terminalis, are parts of the bronchial tree that do contain cartilage in their walls.