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submitted by humble_station(62), 2019-09-26T22:43:00Z
In a pancreatic B cell glucose enters via GLUT 2 and enters glycolysis. This causes the increased concentration of ATP in the cell causes the closure of ATP sensitive K+ channels. When this happens the cells becomes depolarized allowing Voltage gated Ca2+ channels to be open. The Ca2+ allows for exocytosis of insulin into the blood vessel.
Hence the answer here... Fusion of an intracellular vesicle with the plasma membrane.
pg 324 FA 2019 has the image