The correct answer is option 1: Pancreas. The pancreas is an organ located in the abdominal cavity. It plays a crucial role in digestion and hormone regulation. One of the hormones it secretes is insulin. Insulin is responsible for regulating glucose levels in the body. When we eat, the pancreas releases insulin into the bloodstream. It helps cells absorb glucose from the blood, allowing it to be used as energy or stored for later use. Without insulin, glucose would build up in the blood, leading to high blood sugar levels and potentially causing diabetes. Therefore, the pancreas is an essential organ in maintaining the balance of blood sugar levels in the body.