![]() The alveolar membrane is the gas exchange surface, surrounded by a network of capillaries. The acini are the basic units of respiration, with gas exchange taking place in all the alveoli present. They are located sparsely in these bronchioles, line the walls of the alveolar ducts, and are more numerous in the blind-ended alveolar sacs. Īlveoli are first located in the respiratory bronchioles that mark the beginning of the respiratory zone. ![]() Alveoli make up the functional tissue of the mammalian lungs known as the lung parenchyma, which takes up 90 percent of the total lung volume. ![]() ![]() Oxygen is exchanged for carbon dioxide at the blood–air barrier between the alveolar air and the pulmonary capillary. A pulmonary alveolus (plural: alveoli, from Latin alveolus, "little cavity"), also known as an air sac or air space, is one of millions of hollow, distensible cup-shaped cavities in the lungs where pulmonary gas exchange takes place. ![]()
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