Islets of Langerhans are

Options

A. modified lymph glands
B. ductless glands in pancreas
C. specialized area inpituitary
D. small tubules in kidney

Answer

**Step-by-Step Solution:**

1. **Understanding the Islets of Langerhans**: The Islets of Langerhans are clusters of cells located in the pancreas. They play a crucial role in the endocrine system by producing hormones that regulate blood sugar levels.

2. **Identifying the Nature of Islets**: The Islets of Langerhans are not modified lymph glands, nor are they specialized areas in the pituitary gland or small tubules in the kidney. They are specifically part of the pancreas.

3. **Pancreas as a Mixed Gland**: The pancreas is classified as a mixed gland because it has both endocrine (hormone-secreting) and exocrine (enzyme-secreting) functions. The Islets of Langerhans are the endocrine part of the pancreas.

4. **Types of Cells in the Islets**: The Islets of Langerhans contain several types of cells:
- **Alpha cells**: These cells secrete glucagon, which increases blood glucose levels.
- **Beta cells**: These cells produce insulin, which lowers blood glucose levels.
- **Delta cells**: These cells secrete somatostatin, which regulates the endocrine system and inhibits the secretion of other hormones.
- **F cells**: These cells secrete pancreatic polypeptide, which plays a role in regulating pancreatic secretions.

5. **Conclusion**: The correct identification of the Islets of Langerhans is that they are ductless glands located in the pancreas, responsible for hormone production. Therefore, the correct answer to the question is that they are "ductless glands in the pancreas."