What role does insulin play in regulating blood glucose levels?

• A. It increases blood glucose levels
• B. It lowers blood glucose levels
• C. It prevents glucose absorption
• D. It enhances glycogen synthesis

Answer: (B)

Insulin plays a pivotal role in regulating blood glucose levels by lowering them. When blood glucose levels rise after eating, the pancreas releases insulin into the bloodstream. Insulin facilitates the uptake of glucose by cells, particularly muscle and fat cells, allowing them to use glucose for energy or store it for future use. Additionally, insulin stimulates the liver to convert excess glucose into glycogen through a process called glycogenesis, which further helps to reduce blood glucose levels.

By promoting both cellular uptake of glucose and glycogen synthesis, insulin effectively lowers the concentration of glucose in the blood, thereby maintaining homeostasis and preventing hyperglycemia. This regulatory function is crucial for overall metabolic health and energy balance, as elevated blood glucose levels can lead to various health issues, including diabetes.