What is the role of insulin in glucose regulation?

• A. Facilitates glucose uptake by cells
• B. Increases blood glucose levels
• C. Promotes glucose storage in the liver
• D. Inhibits glucose release from muscles

Answer: (A)

Insulin plays a critical role in glucose regulation, primarily by facilitating glucose uptake by cells. When blood glucose levels rise, such as after eating, the pancreas releases insulin. This hormone binds to insulin receptors on the surface of cells, particularly in muscle and adipose (fat) tissue, allowing glucose to enter these cells. Once inside the cells, glucose can be utilized for energy, converted to glycogen for storage, or transformed into fat.

This process helps lower blood glucose levels and is essential for maintaining homeostasis. Without adequate insulin, cells cannot efficiently absorb glucose, leading to elevated blood sugar levels and, over time, potential complications such as diabetes mellitus.

Insulin's role goes beyond just promoting absorption; it also stimulates the liver to store glucose as glycogen and inhibits the production of glucose by the liver, contributing further to its effects on lowering blood glucose levels.