What are the effects of epinephrine? Epinephrine is a hormone and a neurotransmitter. It is secreted in the medulla of the kidney. The primary function of epinephrine is in the ‘flight or fight’ response to short term stress. Epinephrine has a variety of effects in different areas of the body including the breakdown of glycogen to glucose, the release of glucose into the body, increased heart rate, increased breathing rate, increased metabolic rate, increased flow of blood to the brain and skeletal muscles, and decreased flow of blood to the digestive system. All of these changes allow the body to respond quickly to any external danger.
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