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air sac
air sacn.1. An air-filled space in the body of a bird that forms a connection between the lungs and bone cavities and aids in breathing and temperature regulation.2. See alveolus.3. A saclike, thin-walled enlargement in the trachea of an insect.4. An inflatable pouch attached to the larynx in certain mammals, including the nonhuman great apes.air sac n 1. (Zoology) any of the membranous air-filled extensions of the lungs of birds, which increase the efficiency of gaseous exchange in the lungs 2. (Zoology) any of the thin-walled extensions of the tracheae of insects having a similar function air′ sac`
n. 1. alveolus (def. 2). 2. any of certain cavities in a bird's body connected with the lungs. [1820–30] air sac1. An air-filled space in the body of a bird that forms a connection between the lungs and bone cavities. See alveolus.2. A sac-like enlargement in the trachea of an insect.3. A bag-like piece of skin or tissue below the jaw of certain animals, such as the bullfrog and orangutan, that can be inflated to increase sound production.Thesaurus| Noun | 1. |  air sac - a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passagewaysair cell, alveoluslung - either of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the bloodsac - a structure resembling a bag in an animal | | 2. | air sac - any of the thin-walled extensions of the tracheae of insectsinsect - small air-breathing arthropodsac - a structure resembling a bag in an animal | | 3. | air sac - any of the membranous air-filled extensions of the lungs of birdsbird - warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wingssac - a structure resembling a bag in an animal |
air sac
air sac[′er ‚sak] (geology) vesicle (invertebrate zoology) One of the large, thin-walled structures associated with the tracheal system of some insects. (vertebrate zoology) In birds, any of the small vesicles that are connected with the respiratory system and located in bones and muscles to increase buoyancy. air sac
al·ve·o·lar sac1. terminal dilation of the alveolar ducts, which give rise to alveoli in the lung; a small air chamber in the pulmonary tissue from which the pulmonary alveoli project like bays and into which an alveolar duct opens; Synonym(s): sacculus alveolaris [TA]2. in birds, air-containing extensions of bronchi that connect with bone cavities. Synonym(s): air sacair sacn.1. An air-filled space in the body of a bird that forms a connection between the lungs and bone cavities and aids in breathing and temperature regulation.2. See alveolus.3. A saclike, thin-walled enlargement in the trachea of an insect.4. An inflatable pouch attached to the larynx in certain mammals, including the nonhuman great apes. Fig. 18 Air sac . The air-sac system of a bird (left-side). air sac a thin-walled extension to the lungs, present in the thorax, abdomen and bones of birds. Air sacs also occur as diverticula (outgrowths) of the TRACHEA in insects, where, as in birds, they are important in respiration.air sac
Related to air sac: bronchioleSynonyms for air sacnoun a tiny sac for holding air in the lungsSynonymsRelated Wordsnoun any of the thin-walled extensions of the tracheae of insectsRelated Wordsnoun any of the membranous air-filled extensions of the lungs of birdsRelated Words |