Which of the following represents the action of insulin?

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Decreases blood glucose levels by forming glycogen.

Increases blood glucose level by stimulating glucagon production.

Increases blood glucose levels by hydrolysis of glycogen.

Increases blood glucose levels by promoting cellular uptake of glucose.

answer is B.

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Detailed Solution

Insulin decreases blood glucose level by stimulating glycogenesis (conversion of glucose into glycogen).

(1) Insulin does not stimulate glucagon production. A fall in blood glucose levels stimulates the production of glucagon.

(3) Insulin decreases blood glucose level by promoting cellular uptake of glucose.

(4) Glucagon increases blood glucose levels by stimulating glycogenolysis. The second step of glycogenolysis is the hydrolysis of $α 1 \to 6$ glycosidic bonds. The last (fourth) step of glycogenolysis is the hydrolysis of glucose-6-phosphate to glucose.

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