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Glucagon is a peptide hormone, produced by alpha cells of the pancreas. It raises the concentration of glucose and fatty acids in the bloodstream and is considered to be the main catabolic hormone of the body. [ 1 ]
The pancreas maintains constant blood glucose levels (shown as the waving line). When the blood glucose level is too high, the pancreas secretes insulin and when the level is too low, the pancreas secretes glucagon. Cells within the pancreas help to maintain blood glucose levels (homeostasis). The cells that do this are located within the ...
There are about 1 million islets distributed throughout the pancreas of a healthy adult human. While islets vary in size, the average diameter is about 0.2 mm. [5]:928 Each islet is separated from the surrounding pancreatic tissue by a thin, fibrous, connective tissue capsule which is continuous with the fibrous connective tissue that is interwoven throughout the rest of the pancreas.
This causes depolarization across the membrane causing calcium ion channels to open, allowing calcium to flood into the cell. This increase in the cellular concentration of calcium causes secretory vesicles containing glucagon to fuse with the plasma membrane, thus causing the secretion of glucagon from the pancreas. [5]
Insulin, which lowers blood sugar, and glucagon, which raises it, are the most well known of the hormones involved, but more recent discoveries of other glucoregulatory hormones have expanded the understanding of this process. The gland called pancreas secretes two hormones and they are primarily responsible to regulate glucose levels in blood. [1]
It triggers the release of insulin from the pancreas and prevents the release of glucagon. The hormone also slows down the rate at which your stomach empties its contents, helping you feel full ...