What is the mechanism of action of insulin, and what are key nursing considerations for subcutaneous administration?

• A. Insulin raises blood glucose by stimulating hepatic glucose production.
• B. Insulin should never be stored in the refrigerator.
• C. Insulin acts only in the liver.
• D. Insulin lowers blood glucose by promoting uptake; monitor for hypoglycemia, rotate injection sites, proper storage, ensure correct dosing with meals, and avoid mixing errors unless appropriate.

Answer: (D)