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- W2328626289 abstract "This is the first description of the ventilatory response of the Atlantic cod (Gadus morhua) to hypoxia. Using a pharmacological approach, we tested the hypotheses that during hypoxia (1) elevation of circulating catecholamines, arising from chromaffin tissue or peripheral adrenergic neurones, contributes to hyperventilation and that (2) the hyperventilatory response can be modulated by the hypoxia-induced hypertension. The ventilatory response to hypoxia (final water PO₂ = 46 mmHg, reached in ≤25 min) was not significantly altered by pretreatment offish with either α-or β-adrenoceptor antagonists (phentolamine or sotalol, respectively) or with an inhibitor of catecholamine release from peripheral neurones (bretylium), despite a significant increase in plasma catecholamine levels in all treatment groups. Since the utilized regime did not induce metabolic acidosis (a potential ventilatory stimulant), we conclude that the hyperventilation was caused solely by a depression of the oxygen status. Although changes in the internal as well as the external oxygen status may have potentially contributed to the hyperventilation, we suggest, on the basis of the rapid ventilatory response after only small depressions of water PO₂, that the initial stimulus is external. During hypoxia, a doubling of mean ventral aortic blood pressure was observed. This elevation of blood pressure was due to an increased adrenergic nervous and humoral activity. The lack of modification in the ventilatory response to hypoxia after transient or persistent abolishment of the hypertension by pharmacological agents (bretylium or phentolamine, respectively) indicated that during hypoxia there was no relationship between blood pressure and ventilation in this species." @default.
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- W2328626289 date "1991-07-01" @default.
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- W2328626289 title "The Role of Circulating Catecholamines in the Ventilatory and Hypertensive Responses to Hypoxia in the Atlantic Cod (<i>Gadus morhua</i>)" @default.
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- W2328626289 doi "https://doi.org/10.1086/physzool.64.4.30157958" @default.
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