Hormones are secreted by ductless glands of human body. Iodine containing hormone is

Options

A. Insulin
B. adrenaline
C. testosterone
D. thyroxine

Answer

To solve the question about which iodine-containing hormone is secreted by ductless glands in the human body, we can analyze the options provided. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Types of Hormones
Hormones can be classified into different types based on their structure. The primary types include peptide hormones, steroid hormones, and amine hormones.

### Step 2: Analyze Each Option
1. **Insulin**:
- Insulin is a peptide hormone produced by the pancreas.
- It does not contain iodine in its structure.
- **Conclusion**: Insulin is not the iodine-containing hormone.

2. **Androlin**:
- Androlin is an amine hormone.
- Its structure does not include iodine.
- **Conclusion**: Androlin is not the iodine-containing hormone.

3. **Testosterone**:
- Testosterone is a steroid hormone and a male sex hormone.
- It does not contain iodine in its structure.
- **Conclusion**: Testosterone is not the iodine-containing hormone.

4. **Thyroxine**:
- Thyroxine (T4) is an amine hormone produced by the thyroid gland.
- Its chemical formula is C15H11I4NO4, indicating the presence of four iodine atoms.
- **Conclusion**: Thyroxine is the iodine-containing hormone.

### Step 3: Final Answer
Based on the analysis, the hormone that contains iodine and is secreted by ductless glands in the human body is **Thyroxine**.