Thyrocalcitonin

Options

A. Elevates `K^(+)` level in blood
B. Lowers `Ca^(++)` level in blood
C. Elevates `Ca^(2+)` level in blood
D. None of the above

Answer

### Step-by-Step Solution:

1. **Understanding Thyrocalcitonin**:
- Thyrocalcitonin, commonly known as calcitonin, is a hormone produced by the thyroid gland. Its primary function is related to calcium metabolism in the body.

2. **Analyzing the Options**:
- The question provides four options regarding the function of thyrocalcitonin:
- A) Elevates potassium (K+) level in blood
- B) Lowers Ca2+ (calcium) level in blood
- C) Elevates calcium level in blood
- D) None of the above

3. **Eliminating Incorrect Options**:
- Option A can be ruled out because calcitonin is not involved in potassium regulation.
- Option C can also be ruled out because calcitonin does not elevate calcium levels; rather, it has the opposite effect.

4. **Identifying the Correct Function**:
- Calcitonin is known as a hypocalcemic hormone, which means it functions to lower the calcium levels in the blood. This aligns with option B.

5. **Conclusion**:
- Therefore, the correct answer is **B) Lowers Ca2+ level in blood**.