Glucagon is secreted from which cells of Islet of Langerhans

Options

A. `alpha` cells
B. `beta` cells
C. `gamma`- cells
D. Both `alpha` and `beta` cells

Explanation

**Step-by-Step Solution:**

1. **Identify the Question:** The question asks about the specific cells in the Islets of Langerhans that secrete glucagon.

2. **Understand the Islets of Langerhans:** The Islets of Langerhans are clusters of cells in the pancreas that play a crucial role in hormone secretion.

3. **Know the Types of Cells:** There are three main types of cells in the Islets of Langerhans:
- Alpha cells
- Beta cells
- Delta cells

4. **Identify the Function of Each Cell Type:**
- **Alpha cells:** These cells secrete glucagon, which raises blood glucose levels.
- **Beta cells:** These cells secrete insulin, which lowers blood glucose levels.
- **Delta cells:** These cells secrete somatostatin, which regulates the secretion of both glucagon and insulin.

5. **Focus on Glucagon:** Since the question specifically asks about glucagon, we need to identify which cell type is responsible for its secretion.

6. **Conclusion:** Glucagon is secreted from the alpha cells of the Islets of Langerhans.

7. **Final Answer:** The correct answer is that glucagon is secreted from the alpha cells.

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