Epinephrine

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Diagram showing how epinephrine binding to a beta-adrenergic receptor on a cell membrane activates a G-protein, which then stimulates adenylyl cyclase to convert ATP into cyclic AMP (cAMP), leading to physiological effects such as increased heart rate, blood vessel dilation, and glycogen breakdown.

Two EpiPen auto-injectors with yellow labels and blue caps are shown in front of a yellow EpiPen 2-Pak box, used for emergency allergic reaction treatment.

Diagram showing the organization of the autonomic nervous system, with labeled pathways for parasympathetic and sympathetic nerves, highlighting synapses, neurotransmitters like acetylcholine and norepinephrine, and their receptor types.

At a Glance

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epinephrine summary

Epinephrine: Media

hormone

Images

Diagram showing how epinephrine binding to a beta-adrenergic receptor on a cell membrane activates a G-protein, which then stimulates adenylyl cyclase to convert ATP into cyclic AMP (cAMP), leading to physiological effects such as increased heart rate, blood vessel dilation, and glycogen breakdown.

Epinephrine-stimulated cAMP synthesis

In cells the stimulatory effects of epinephrine are mediated through the activation...

Encyclopædia Britannica, Inc.

Two EpiPen auto-injectors with yellow labels and blue caps are shown in front of a yellow EpiPen 2-Pak box, used for emergency allergic reaction treatment.

Epinephrine autoinjector

The hormone epinephrine can be administered rapidly using an epinephrine autoinjector.

© Alkerk/Dreamstime.com

Diagram showing the organization of the autonomic nervous system, with labeled pathways for parasympathetic and sympathetic nerves, highlighting synapses, neurotransmitters like acetylcholine and norepinephrine, and their receptor types.

Figure 2: Organization of the autonomic nervous system.

Encyclopædia Britannica, Inc.