Insulin secreted by the body differs from insulin administered by injection in which of the following ways?

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Natural insulin is formed as a prohormone called proinsulin. C-peptide is cleaved away from proinsulin to form the insulin that circulates in the blood. People with type 1 diabetes mellitus, who make little or no natural insulin, do not have C-peptide present in their blood. Both natural insulin and exogenously injected insulins regulate blood glucose levels. One way blood glucose levels are regulated by insulin is via its ability to encourage skeletal muscle cells to take up glucose.

Insulin Secreted by the Body Differs from Insulin Administered by Injection