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Alveolus (/ æ l ˈ v iː ə l ə s /; pl. alveoli, adj. alveolar) is a general anatomical term for a concave cavity or pit. Uses in anatomy and zoology
New alveoli continue to form until the age of eight years. [5] A typical pair of human lungs contains about 480 million alveoli, [11] providing a total surface area for gas exchange of between 70 and 80 square metres. [10] Each alveolus is wrapped in a fine mesh of capillaries covering about 70% of its area. [12]
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The alveoli are the dead end terminals of the "tree", meaning that any air that enters them has to exit via the same route. A system such as this creates dead space, a volume of air (about 150 ml in the adult human) that fills the airways after exhalation and is breathed back into the alveoli before environmental air reaches them.
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The process of breathing does not fill the alveoli with atmospheric air during each inhalation (about 350 ml per breath), but the inhaled air is carefully diluted and thoroughly mixed with a large volume of gas (about 2.5 liters in adult humans) known as the functional residual capacity which remains in the lungs after each exhalation, and ...
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Focal emphysema is a localized region of emphysema in the lung that is larger than alveoli, and often associated with coalworker's pneumoconiosis. [40] This is also known as localized pulmonary emphysema. [41] Blebs and bullae may also be included as focal emphysema.