Why is pancreas called a heterocrine gland ?

Explanation

**Step-by-Step Solution:**

1. **Definition of Heterocrine Gland**: A heterocrine gland is a type of gland that has both endocrine and exocrine functions. This means it can secrete substances both into the bloodstream and into ducts.

2. **Pancreas as a Mixed Gland**: The pancreas is classified as a mixed gland or heterocrine gland because it performs both endocrine and exocrine functions.

3. **Endocrine Function**: The endocrine part of the pancreas consists of the islets of Langerhans, which are clusters of cells that release hormones directly into the bloodstream. The two main types of cells in the islets are:
- **Alpha cells**: These cells produce the hormone glucagon, which raises blood glucose levels.
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