The action of sympathomimetic amines on circular and longitudinal smooth muscle from the isolated oesophagus of the guinea-pig

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Abstract
The responses to sympathomimetic amines of circular and longitudinal preparations of smooth muscle from the isolated oesophagus of the guinea-pig have been investigated. Evidence is provided for the existence of α-excitatory and β-inhibitory adrenergic receptors in both circular and longitudinal smooth muscle preparations.