glucagon

[gloo-kuh-gon]
noun Biochemistry.
a hormone secreted by the pancreas that acts in opposition to insulin in the regulation of blood glucose levels.

Origin:
1923; probably gluc- + Greek ágōn present participle of ágein to lead, drive; see -agogue

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World English Dictionary
glucagon (ˈɡluːkəˌɡɒn, -ɡən)
 
n
Compare insulin a polypeptide hormone, produced in the pancreas by the islets of Langerhans, that stimulates the release of glucose into the blood
 
[C20: from gluc(ose) + -agon, perhaps from Greek agein to lead]

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American Heritage
Medical Dictionary

glucagon glu·ca·gon (glōō'kə-gŏn')
n.
A polypeptide hormone secreted by alpha cells that initiates a rise in blood sugar levels by stimulating the breakdown of glycogen by the liver.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
glucagon   (gl'kə-gŏn')  Pronunciation Key 
A polypeptide hormone produced by the pancreas that stimulates an increase in blood glucose levels, thus opposing the action of insulin.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

glucagon

a pancreatic hormone produced by cells in the islets of Langerhans. Glucagon, a protein of low molecular weight, strongly opposes the action of insulin; it raises the concentration of sugar (glucose) in the blood by promoting the breakdown of glycogen (the form in which glucose is stored in the liver). It also reduces the rate of glycogen synthesis, promotes the breakdown of protein, and promotes the metabolism of fat. Gastrointestinal glucagon, another form, is secreted into the blood when glucose is ingested; its only action appears to be to stimulate the secretion of insulin.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Persons with severe hypoglycemia are treated with glucose injections or the hormone glucagon.
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