Final answer:
The peptide hormone secreted by the pancreas during starvation is glucagon, which stimulates the breakdown of glycogen in the liver to increase blood glucose levels. Glucagon works in opposition to insulin and helps stabilize blood glucose levels.
Step-by-step explanation:
The peptide hormone that is secreted by the pancreas into our bloodstream during starvation is glucagon. Glucagon is released from the alpha cells in the pancreas when the body needs to generate additional energy. It stimulates the breakdown of glycogen in the liver to increase blood glucose levels. Its effect is the opposite of insulin, and together glucagon and insulin help stabilize blood glucose levels by acting as part of a negative-feedback system.