Hormone that stimulates the process of bone resorption is

Options

A. Parathyroid hormone
B. Calorigenic hormone
C. Thyroxine
D. Catecholamines

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the hormone that stimulates the process of bone resorption. Bone resorption is the process where bone tissue is broken down, releasing minerals, and resulting in a transfer of calcium from bone to the blood.

2. **Identifying the Options**: The options provided are:
- Parathyroid hormone
- Calorigenic hormone
- Thyroxin
- Catecholamines

3. **Analyzing Each Option**:
- **Parathyroid Hormone (PTH)**: This hormone is secreted by the parathyroid glands. It plays a crucial role in regulating calcium levels in the blood. PTH stimulates bone resorption, leading to an increase in blood calcium levels.
- **Calorigenic Hormone**: This hormone is involved in increasing oxygen uptake by cells and enhancing metabolic processes. It does not directly influence bone resorption.
- **Thyroxin**: This hormone is primarily responsible for regulating metabolism, heart function, and growth. It does not play a direct role in stimulating bone resorption.
- **Catecholamines**: These hormones (like adrenaline) are involved in the body's stress response and do not stimulate bone resorption.

4. **Conclusion**: Based on the analysis, the hormone that stimulates the process of bone resorption is **Parathyroid Hormone (PTH)**.

5. **Final Answer**: The correct answer is **Parathyroid hormone**.

---