The alpha 1 1 adrenergic receptor is a g protein coupled receptor gpcr associated with the g q heterotrimeric g protein it consists of three highly homologous subtypes including 1a 1b and 1d adrenergic . The types of sympathetic or adrenergic receptors are alpha beta 1 and beta 2 alpha receptors are located on the arteries when the alpha receptor is stimulated by epinephrine or norepinephrine . Alpha 1 adrenergic receptors mediate smooth muscle contraction the increased density of alpha 1 subtype a adrenergic receptors in the prostate stroma leads to increased muscle tone in the prostate and bladder neck that can restrict urine flow. Alpha receptors can be classified as a subtype of adrenergic receptor their activation triggers a complex range of autonomic responses that will be detailed in the following article we recommend our readers to check our article on beta receptors for further information on autonomic pharmacology article contents alpha 1 receptors alpha 2 receptors
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