What hormone is secreted by alpha cells of the pancreas?

The hormone secreted by the alpha cells of the pancreas is glucagon. Glucagon plays a crucial role in glucose metabolism and is primarily responsible for raising blood glucose levels. When blood sugar levels drop, glucagon is released into the bloodstream, stimulating the liver to convert stored glycogen into glucose, which is then released into the blood. This process is vital for maintaining homeostasis, especially during periods of fasting or between meals.

The alpha cells of the pancreas work in conjunction with beta cells, which secrete insulin. While insulin lowers blood sugar levels by facilitating cellular uptake of glucose, glucagon has the opposite effect, ensuring that the body has a constant supply of glucose for energy. This coordinated action of both hormones is essential for overall metabolic balance.