Which of the following does not play any role in calcium balnce in the human body?

Options

A. Vitamin D
B. Parathyroid homone
C. Thyrocalcitonin
D. Thymosin

Answer

To solve the question of which of the following does not play any role in calcium balance in the human body, we will analyze each option provided:

1. **Vitamin D**:
- Vitamin D is crucial for calcium homeostasis in the body. It regulates intestinal calcium absorption, urinary calcium excretion, and bone metabolism. Therefore, it plays a significant role in maintaining calcium balance.

2. **Parathyroid Hormone (PTH)**:
- PTH is secreted by the parathyroid glands and is vital for maintaining serum calcium levels. It increases blood calcium levels by promoting bone resorption (breakdown of bone to release calcium) and enhancing calcium reabsorption in the kidneys. Thus, PTH also plays a crucial role in calcium balance.

3. **Thyrocalcitonin (Calcitonin)**:
- Calcitonin is released by the thyroid gland and works to lower blood calcium levels by inhibiting bone resorption and promoting bone formation. It acts in opposition to PTH, making it another important player in calcium regulation.

4. **Thymosin**:
- Thymosin is produced by the thymus gland and is primarily involved in the maturation of T lymphocytes, which are essential for the immune response. It does not have any known role in calcium balance.

After analyzing all the options, we can conclude that the correct answer is:

**Option D: Thymosin** does not play any role in maintaining calcium balance in the human body.