Glucagon is secreted by specific cells within the pancreas.
The Secretory Cells: Alpha Cells
The hormone glucagon is produced by alpha cells, which are located within the pancreatic islets of Langerhans. These islets are clusters of endocrine cells scattered throughout the pancreas.
- Pancreatic Islets: These specialized areas house the endocrine cells responsible for producing hormones like insulin and glucagon.
- Alpha Cells: Specifically, the alpha cells within these islets are tasked with synthesizing and releasing glucagon.
The reference provided states, "Glucagon is a peptide hormone secreted from the alpha cells of the pancreatic islets of Langerhans."
Function of Glucagon
Glucagon plays a crucial role in glucose homeostasis, working to increase blood sugar levels when they are too low.
- It is released in response to low blood sugar.
- Glucagon stimulates the liver to convert stored glycogen into glucose and releases it into the bloodstream.
| Cell Type | Hormone Secreted | Primary Function |
|---|---|---|
| Alpha Cells | Glucagon | Increases blood glucose levels |
| Beta Cells | Insulin | Decreases blood glucose levels |
| Delta Cells | Somatostatin | Regulates insulin and glucagon secretion |
In summary, alpha cells within the pancreatic islets of Langerhans are responsible for secreting glucagon.
