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make up 60% of the cells in the islets. Along with alpha cells, beta cells help to maintain glucose levels in the body. In response to high blood sugar, beta cells secrete insulin, a hypoglycemic hormone. Insulin decreases blood glucose level by helping cells to take up and metabolize glucose, and by stopping the liver from releasing more glucose. Insulin also performs other metabolic functions: causing muscle cells to take up amino acids, and inhibiting the breakdown and release of fats.Delta cells

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