Effect of adrenergic blocking agents on peripheral noradrenaline induced thermoregulatory responses in the pigeon at heat

Abstract
The hyperthermic effect of intramuscular NA at 32°C was abolished by propranolol but not by phentolamine preinjection. The lack of hyperthermic response was at least partly due to the blocking effect of propranolol on beta-receptor mediated increase in heart rate. After NA the respiratory rate was gradually increased in birds preinjected either with propranolol or with phentolamine.

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