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alveoli  Alveoli are formed to increase the density of gas exchange surface on the acinar airway tree, thus facilitating diffusion of oxygen to and into the capillaries  The alveoli form clusters, called alveolar sacs, that resemble bunches of grapes By the same analogy, the alveolar ducts leading to the sacs are like the stems

moves oxygen out of the alveoli and into the blood Back to top Breathing, respiration and gas exchange  They are thin, squamous, and flat epithelial lining cells that form the structure of the alveoli They have long cytoplasmic extensions that cover beyond 95%

ALVEOLI definition: 1 plural of alveolus specialized 2 plural of alveolus specialized Learn more  Alveoli The alveoli are the final branchings of the respiratory tree and act as the primary gas exchange units of the lung The gas-blood barrier between the