The chemical nature of hormones secreted by `alpha and delta` cells of pancreas is

Options

A. glycolipid
B. glycoprotein
C. steroid
D. polypeptide

Answer

To answer the question regarding the chemical nature of hormones secreted by alpha and delta cells of the pancreas, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Cells of the Pancreas**:
- The pancreas contains different types of cells, including alpha cells and beta cells.
- Alpha cells secrete glucagon, while beta cells secrete insulin.

2. **Understand the Hormones Secreted**:
- **Glucagon**: This hormone is secreted by alpha cells. It plays a crucial role in increasing blood glucose levels.
- **Insulin**: This hormone is secreted by beta cells. It helps in lowering blood glucose levels.

3. **Determine the Chemical Nature of Glucagon**:
- Glucagon is classified as a peptide hormone. Specifically, it is a single-chain polypeptide consisting of 29 amino acids.

4. **Determine the Chemical Nature of Insulin**:
- Insulin is also a peptide hormone, but it consists of two chains (A and B chains). The A chain has 21 amino acids, and the B chain has 30 amino acids, making insulin a polypeptide hormone as well.

5. **Conclude the Chemical Nature of Both Hormones**:
- Both glucagon and insulin are classified as polypeptide hormones. Therefore, the chemical nature of the hormones secreted by the alpha and beta cells of the pancreas is polypeptide.

### Final Answer:
The chemical nature of the hormones secreted by the alpha and beta cells of the pancreas is polypeptide.

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