Summary
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1.
The isolated, saline-perfused head of the freshwater rainbow trout (Salmo gairdneri) was used to investigate adrenergic control of branchial chloride transport.
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2.
Perfusing only with physiological saline (no catecholamines present) resulted in extremely low values of chloride influx (J iCl−) which approached zero with time.
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3.
By perfusing with a range of sympathetomimetics and adrenergic antagonists, it was demonstrated that branchial chloride influx was enhanced by alpha receptor stimulation and inhibited by beta receptor stimulation.
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4.
It is proposed that the effects of catecholamines onJ iCl− are specific in nature and not due to accompanying haemodynamic alterations.
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5.
From the results of these experiments, together with previous knowledge of adrenergic effects on branchial Na+/H+ (NH +4 ) exchange, it is possible to postulate a scheme for piscine acid-base regulation involving altered rates of Cl−/HCO −3 and Na+/H+ (NH +4 ) exchanges, both a result of adrenergic stimulation.
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Perry, S.F., Payan, P. & Girard, J.P. Adrenergic control of branchial chloride transport in the isolated perfused head of the freshwater trout (Salmo gairdneri). J Comp Physiol B 154, 269–274 (1984). https://doi.org/10.1007/BF02464406
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DOI: https://doi.org/10.1007/BF02464406