Alpha (α)-adrenergic receptor

Definition

Alpha-adrenergic receptors are proteins located on the surface of cells in various tissues that respond to adrenaline and noradrenaline by triggering vasoconstriction, pupil dilation, and other physiological responses. They play a crucial role in the sympathetic division of the autonomic nervous system, helping regulate cardiovascular function, pupil size, and more.

Related terms

Adrenaline:

A hormone and neurotransmitter produced by the adrenal glands that increases heart rate, muscle strength, blood pressure, and sugar metabolism.

Noradrenaline: A neurotransmitter involved in arousal and the fight-or-flight response, primarily acting on alpha receptors.

Sympathetic Nervous System:

Part of the autonomic nervous system that prepares the body for physical activity by increasing heart rate, constricting blood vessels, raising blood pressure, and dilating air passages