The hormone that stimulates glycogenolysis is glucagon.
Understanding Glycogenolysis
Glycogenolysis is the breakdown of glycogen, a stored form of glucose, into glucose molecules. This process is crucial for maintaining blood glucose levels, especially when the body needs energy and glucose intake is insufficient.
The Role of Glucagon
Glucagon is a peptide hormone produced by alpha cells in the pancreas. Here's how it relates to glycogenolysis:
- Low Blood Sugar Trigger: When blood glucose levels drop, the pancreas releases glucagon.
- Liver Action: Glucagon acts primarily on the liver. It binds to receptors on liver cells, initiating a signaling cascade that activates enzymes involved in glycogenolysis.
- Glucose Release: These enzymes break down stored glycogen into glucose, which is then released into the bloodstream, raising blood sugar levels back to normal.
Key Takeaways
| Hormone | Primary Action | Effect on Blood Glucose |
|---|---|---|
| Glucagon | Stimulates glycogenolysis | Increases blood glucose |
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Reference: As stated in the provided material, "Glucagon is the hormone that stimulates glycogenolysis..."
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Practical Insight: Glucagon's role is vital in periods of fasting or intense physical activity, when the body needs a quick supply of glucose for energy.
In summary, glucagon is the key hormone responsible for triggering glycogenolysis, the process that breaks down glycogen to release glucose into the bloodstream.
