The term asthma may be modified by words or phrases indicating its etiology, factors provoking attacks, or its duration.Ītropine : A poisonous white crystalline alkaloid, C17H23NO3, from belladonna and related plants, used to relieve spasms of smooth muscles. An alveolus is an ultimate respiratory unit where the gas exchange takes place.Īsthma : A disease characterized by an increased responsiveness of the airways to various stimuli and manifested by slowing of forced expiration which changes in severity either spontaneously or as a result of therapy. The majority of alveoli arise from the alveolar ducts that are lined with the alveoli. To be contrasted with AIR SPACES.Īllergen : A material that, as a result of coming into contact with appropriate tissues of an animal body, induces a state of allergy or hypersensitivity generally associated with idiosyncratic hypersensitivities.Īlveolus : Hexagonal or spherical air cells of the lungs. To be contrasted with AIRWAYS.Īirways: All passageways of the respiratory tract from mouth or nose down to and including respiratory bronchioles.
Air spaces: All alveolar ducts, alveolar sacs, and alveoli.
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