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The mechanism of body temperature changes induced by intraventricular injections of adrenaline, noradrenaline and 5‐hydroxytryptamine in the ox ( bos taurus )
Author(s) -
Findlay J. D.,
Robertshaw D.
Publication year - 1967
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.1967.sp008171
Subject(s) - chemistry , vasoconstriction , rectal temperature , thermoregulation , serotonin , skin temperature , respiratory rate , medicine , hyperthermia , ventricle , endocrinology , anesthesia , heart rate , biology , biochemistry , receptor , blood pressure , biomedical engineering
1. Adrenaline, noradrenaline and 5‐hydroxytryptamine (5‐HT) were injected into the lateral ventricle of the ox. The effect of these drugs was measured on the respiratory rate, tidal volume, heat production, skin temperature of the ear, evaporative loss from the skin and the rectal temperature at 20 and 10° C ambient temperature. 2. Neither adrenaline (3 mg) nor noradrenaline (3 mg) had any effect on the temperature regulating mechanisms of the ox, except to produce vasoconstriction if vasodilatation was already present due to high ambient temperature or previous injection of 5‐HT. 3. Injection of 5‐HT (5 mg) caused a rise in respiratory rate, a fall in tidal volume and heat production, elevation of ear skin temperature and skin evaporative loss and a decrease in rectal temperature. Sedation of the animals occurred. 4. In its reaction to these monoamines the ox is similar to the goat, sheep and rabbit, but is unlike the cat and dog. 5. It was concluded that neither adrenaline nor noradrenaline has a role in the central control of temperature regulation in the ox, but that 5‐HT may be involved in the control of heat dissipation mechanisms.