alveolus defined in 1951 year

alveolus - alveolus;
alveolus - (1) Minute air-filled sac in vertebrate lung, thin-walled and surrounded by blood-vessels. There are large numbers of alveoli in each lung, and it is through their surfaces that the respiratory exchange of oxygen and carbon dioxide occurs. In most vertebrates they connect with the mouth by a system of ramifying air-tubes (bronchi and bronchioles). (2) Expanded sac of secretory cells which forms internal termination of each duct in many glands (e.g. mammary glands). (3) Cavity in jaw-bone into which a tooth fits.

near alveolus in Knolik

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letter "A"
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