Abstract
1. Efferent branchial artery tissue rings from Negaprion queenslandicus were used to examine the effects of adrenergic and cholinergic drugs on the vasculature. 2. The presence of α- and β-adrenoceptors were demonstrated. 3. Adrenaline and noradrenaline produced variable, including biphasic, responses. 4. Acetylcholine produced concentration-dependent contractions in the presence of a predominantly intact endothelium.
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