Which is a 32 amio acid water soluble peptide hormone

Options

A. Gastrin
B. Insulin
C. Glucagon
D. Calcitonin.

Answer

To answer the question "Which is a 32 amino acid water-soluble peptide hormone?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: We need to identify a peptide hormone that is composed of 32 amino acids and is water-soluble.

2. **Review the Options**:
- **Gastrin**: A hormone secreted from the stomach that stimulates acid secretion.
- **Insulin**: A hormone secreted by the pancreas that lowers blood sugar levels.
- **Glucagon**: A hormone that raises blood sugar levels, also secreted by the pancreas.
- **Calcitonin**: A hormone produced by the thyroid gland that lowers blood calcium levels.

3. **Analyze Each Option**:
- **Gastrin**: While it is a peptide hormone, it is not specifically known for having 32 amino acids.
- **Insulin**: This hormone is important for glucose metabolism but does not have 32 amino acids (it has 51).
- **Glucagon**: This hormone is important for increasing blood sugar levels but does not consist of 32 amino acids (it has 29).
- **Calcitonin**: This is a polypeptide hormone that is specifically known to consist of 32 amino acids.

4. **Confirm Water Solubility**: All the hormones listed are peptide hormones and are generally water-soluble, but we are specifically looking for the one with 32 amino acids.

5. **Conclusion**: Based on the analysis, the correct answer is **Calcitonin**, as it is a 32 amino acid water-soluble peptide hormone produced by the parafollicular cells of the thyroid gland.

### Final Answer:
**Calcitonin**