What is insulin?

• A. A vitamin produced by the liver.
• B. A hormone produced by the pancreas that regulates blood glucose.
• C. A neurotransmitter produced by the brain.
• D. A sugar produced by the pancreas.

Answer: (B)

Insulin is a hormone produced by the pancreas that regulates blood glucose levels. It signals cells to take in glucose from the bloodstream and promotes its storage as glycogen in the liver and muscles or its conversion to fat, helping to lower blood sugar after meals and keep fasting levels stable. It is not a vitamin, not a neurotransmitter, and not a sugar. This distinction matters in dental practice because many patients with diabetes rely on insulin therapy, and recognizing hypoglycemia or hyperglycemia is crucial for safe management.