Emergency Medical Technician (EMT) Practice Test

The correct response is insulin, which is produced by the pancreas. Insulin plays a crucial role in regulating glucose levels in the bloodstream. When blood sugar levels rise, such as after eating, the pancreas releases insulin to help cells absorb glucose for energy or to store it for later use. This function is vital for maintaining healthy blood sugar levels and overall metabolic balance in the body. In contrast, estrogen is primarily produced by the ovaries and is involved in female reproductive health. Thyroxine is a hormone produced by the thyroid gland, which is important for regulating metabolism. Cortisol is produced by the adrenal glands and helps manage stress and the body's metabolism of fats, proteins, and carbohydrates.