Question

why are some patients of diabetes treated by giving injection of insulin​

Answer 1

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The patients suffering from diabetes have high blood sugar level due to improper secretion of insulin hormone.
To regulate the blood sugar level, some patients of diabetes are treating by giving injection of insulin.

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Answer 2

Insulin performs the function of reducing level of glucose of the blood.

In diabetes the blood glucose level is increased, so insulin is given which increases the cellular uptake of gucose and there by reducing the amount of glucose dissolved in blood.