1. Which of the following best describes the mechanism of action of insulin in the human body? A) Stimulates the breakdown of glycogen to release glucose into the blood B) Enhances the uptake of glucose by cells and promotes its storage as glycogen C) Inhibits the production of glucagon by the pancreas D) Increases blood glucose levels by promoting gluconeogenesis Correct answer: B) Enhances the uptake of glucose by cells and promotes its storage as glycogen Rationale: Insulin is a hormone produced by the pancreas that helps regulate blood sugar levels by promoting the uptake of glucose by cells and facilitating its storage as glycogen. 2. Which of the following best describes the main function of the renal system in the human body?