Glucagon hormone is released by __________

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the source of the glucagon hormone, specifically which cells or organ release it.

2. **Identifying the Source**: Glucagon is a hormone that plays a crucial role in glucose metabolism.

3. **Locating the Cells**: The glucagon hormone is produced by specific cells known as alpha cells.

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