Final answer:
When blood glucose levels fall, the pancreas releases glucagon, which induces the liver to convert glycogen to glucose, raising the glucose levels.
Step-by-step explanation:
When a person's blood glucose level drops too low, the pancreas secretes glucagon, which triggers the liver to break down stored glycogen into glucose. Glucagon is an endocrine hormone secreted by alpha cells of the pancreas.
This hormone plays a crucial role, especially when the body needs to generate additional energy or during periods of starvation. Its primary function is to increase blood glucose levels by stimulating the liver to convert glycogen back into glucose.
The release of glucagon and its effect on the liver is part of a negative-feedback system that ensures blood glucose levels remain within a normal range.
Moreover, glucagon's role is the opposite of insulin, another pancreatic hormone that lowers blood glucose levels by facilitating its uptake into cells and conversion into glycogen for storage, primarily in the liver and muscle tissue.