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How does insulin affect the level of glucose in the blood?
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Blood sediment in test tubes, showing plasma (clear fluid), red blood cells (red), and the release of hemoglobin into the surrounding plasma (pink).
Insulin is a hormone that regulates blood glucose levels by acting primarily on the liver, muscle, and adipose tissue. When blood glucose levels rise, such as after a meal, the pancreas secretes insulin to lower these levels through several key mechanisms:12
- Increased Glucose Uptake: In muscle and adipose tissue, insulin stimulates the translocation of glucose transporters to the cell membrane, facilitating the movement of glucose from the blood into the cells.12
- Enhanced Storage: Once inside cells, insulin promotes the conversion of glucose into glycogen for storage in the liver and muscles.12
- Inhibition of Glucose Production: In the liver, insulin inhibits glycogenolysis (the breakdown of glycogen) and gluconeogenesis (the synthesis of glucose from non-carbohydrate sources), thereby reducing the amount of glucose released into the bloodstream.12
By promoting the utilization and storage of glucose while simultaneously suppressing its production, insulin effectively maintains blood sugar within a healthy range.12