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Adrenaline is also known as epinephrine. Epinephrine is a hormone and a neurotransmitter. A transmitter produced by the adrenal gland and by the sympathetic nervous system.  It causes most of the physical symptoms produced by fear, panic and anxiety. 

When adrenaline (or epinephrine) is secreted into the bloodstream, it rapidly prepares the body for action in emergency situations (or situations that the body perceives to be emergencies). The hormone boosts the supply of oxygen and glucose to the brain and muscles, while suppressing other non-emergency bodily processes (digestion in particular).

It increases heart rate and stroke volume, dilates the pupils, and constricts arterioles in the skin and gastrointestinal tract while dilating arterioles in skeletal muscles. It elevates the blood sugar level by increasing catabolism of glycogen to glucose in the liver, and at the same time begins the breakdown of lipids in fat cells. Like some other stress hormones, epinephrine has a suppressive effect on the immune system.

Social anxiety or panic attacks cause the release of adrenaline.

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