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Control of Insulin Secretion
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Control of Insulin Secretion
Insulin is secreted by the B-cells in the Islets of Langerhans of the pancreas
Normally the cell membrane is polarised, because of the sodium potassium pumps
When blood glucose is high, B-cells absorb more glucose, respire more and produce more ATP
The ATP closes the potassium channels, so the membrane charge changes
Na+ is actively pumped out; K+ can diffuse out. Inside is relatively negative
Calcium channels open, and the calcium initiates the movement of insulin conataining vesicles to the membrane... exocytosis occurs
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- A Levels Biology (Homeostasis) Note on Control of Insulin Secretion, created by beccak432 on 10/12/2013.
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