Thyroxine is also called

Options

A. Monoiodothyronine
B. Diiodothyronine
C. Triiodothyronine
D. Tetraiodothyronine

Answer

**Step-by-Step Solution:**

1. **Identify the Hormone**: The question asks for another name for thyroxine. Thyroxine is a hormone produced by the thyroid gland.

2. **Understand Thyroid Hormones**: The thyroid gland produces two main hormones: T3 (triiodothyronine) and T4 (thyroxine).

3. **Recognize the Common Name**: Thyroxine is commonly referred to as T4.

4. **Explore Alternative Names**: Besides being called T4, thyroxine is also known as tetraiodothyronine. This name reflects that it contains four iodine atoms.

5. **Evaluate the Options**: The options provided are:
- Mono-idothyronine
- Di-iodothyronine
- Tri-iodothyronine
- Tetra-iodothyronine

- **Mono-idothyronine**: Incorrect, as it suggests one iodine atom, which does not apply to thyroxine.
- **Di-iodothyronine**: Incorrect, as it suggests two iodine atoms.
- **Tri-iodothyronine**: Incorrect, as it refers to T3, not T4.
- **Tetra-iodothyronine**: Correct, as it is another name for thyroxine (T4).

6. **Conclusion**: Therefore, the answer to the question "Thyroxine is also called" is tetraiodothyronine.

**Final Answer**: Tetraiodothyronine (T4).

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