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A hormone, also known as epinephrine, that is secreted by the adrenal glands, especially when a person is under stress, because it increases the body's ability to respond to threats. While spelling adrenalin without an extra "e" is technically correct, the more common spelling of this word is adrenaline with the "e."
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"Epinephrine vial 1mg (Adrenalin)" by Jfoldmei is licensed under CC BY.
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Encyclopædia Britannica Online
N.d. Epinephrine and noepinephrine.
http://www.britannica.com/EBchecked/topic/190049/epinephrine-and-norepi…,
accessed December 11, 2014.