The adrenergic receptors of the fundus of rat stomach are both type alpha and type beta. Activation of the alpha-adrenergic receptors gives a diphasic response in which inhibition precedes excitation. The beta-adrenergic receptors mediate exclusively inhibitory response; the beta-adrenergic component of the inhibitory response is clearly observed only when the alpha-adrenergic component is diminished. The beta-receptors can be assigned, with some reserve, to the betaalpha group.
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