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The effects of irritation at various levels of the airway upon tracheal mucus secretion in the cat.
Author(s) -
Phipps R J,
Richardson P S
Publication year - 1976
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.1976.sp011574
Subject(s) - mucus , reflex , stimulation , efferent , receptor , inhalation , irritation , chemistry , respiratory system , medicine , expectorant , vagovagal reflex , lung , anesthesia , endocrinology , pharmacology , immunology , biology , afferent , ecology
1. Sulphated glycoprotein output from the trachea, isolated in situ, has been measured in anaesthetized cats by a radio‐isotopic method. The effects of irritation of various parts of the airway on this mucus output were studied. 2. Mechanical stimulation of the nose and nasopharynx increased tracheal mucus output by reflexes which involved parasympathetic and probably also sympathetic motor pathways. 3. Laryngeal stimulation had a similar through the same motor pathways. 4. Inhalation of ammonia vapour into the lower airways reflexly increased mucus output from the isolated trachea. The efferent pathway for this reflex was mainly or entirely parasympathetic. It is argued that the afferent pathway involved cough receptors. 5. Lung inflation, inhalation of histamine aerosol and intravenous injection of phenyl diguanide (which excite mainly lung stretch receptors, lung 'irritant' receptors and alveolar 'J‐receptors' respectively) had no consistent effect on tracheal mucus secretion. 6. The afferent and efferent pathways of these reflexes are discussed.