The number of peptide hormones among insulin, testosterone, oxytocin, thyroxine, vasopressin, cortisone is

Answer

To determine the number of peptide hormones among the given options (insulin, testosterone, oxytocin, thyroxine, vasopressin, cortisone), we can categorize each hormone based on its structure and classification.

### Step-by-Step Solution:

1. **Identify the Hormones**: The hormones given in the question are:
- Insulin
- Testosterone
- Oxytocin
- Thyroxine
- Vasopressin
- Cortisone

2. **Classify Each Hormone**:
- **Insulin**: This is a peptide hormone. It is a protein made up of amino acids and is involved in glucose metabolism.
- **Testosterone**: This is a steroid hormone, derived from cholesterol. It is lipid-derived and not a peptide.
- **Oxytocin**: This is a peptide hormone. It is a small protein made up of amino acids and is involved in various functions including childbirth and lactation.
- **Thyroxine**: This is an amino acid-derived hormone, specifically derived from the amino acid tyrosine. It is not a peptide.
- **Vasopressin**: Also known as antidiuretic hormone (ADH), this is a peptide hormone. It is involved in regulating water balance in the body.
- **Cortisone**: This is a steroid hormone, similar to testosterone, and is lipid-derived.

3. **Count the Peptide Hormones**: From the classification:
- Insulin: Peptide hormone
- Oxytocin: Peptide hormone
- Vasopressin: Peptide hormone

The total number of peptide hormones is **3** (Insulin, Oxytocin, and Vasopressin).

### Final Answer:
The number of peptide hormones among the given options is **3**.