Which mechanism replaces insulin?

• A. Replace insulin
• B. Improve insulin secretion
• C. Reduce hepatic glucose production
• D. Delay carb absorption

Answer: (A)

Replacing insulin means supplying insulin from outside the body to compensate for little or no endogenous insulin. This approach is used when the pancreas isn’t producing enough insulin, such as in type 1 diabetes or insulin-deficient type 2 diabetes. Exogenous insulin acts to promote glucose uptake into muscle and fat and to suppress glucose production by the liver, helping to bring blood glucose back toward normal levels. The other mechanisms described correspond to different strategies: stimulating the body's own pancreas to secrete more insulin, lowering hepatic glucose output without replacing insulin, or delaying carbohydrate absorption from the gut. Since the question asks for a mechanism that replaces insulin, providing insulin externally is the appropriate choice.