Which of the following ions play important role in blood clotting?

Options

A. `Mg^(+2)`
B. `Na^(+)`
C. `K^(+)`
D. `Ca^(+2)`

Answer

To determine which ion plays an important role in blood clotting, we can analyze the options provided:

1. **Identify the ions listed in the options:**
- Option 1: Mg²⁺ (Magnesium ion)
- Option 2: Na⁺ (Sodium ion)
- Option 3: K⁺ (Potassium ion)
- Option 4: Ca²⁺ (Calcium ion)

2. **Understand the role of each ion in the body:**
- **Mg²⁺ (Magnesium ion):** While magnesium is important for many biochemical reactions, it is not primarily involved in blood clotting.
- **Na⁺ (Sodium ion):** Sodium is crucial for maintaining fluid balance and nerve function, but it does not play a direct role in the clotting process.
- **K⁺ (Potassium ion):** Potassium is essential for muscle function and nerve transmission, but it is not directly involved in blood clotting.
- **Ca²⁺ (Calcium ion):** Calcium is vital for blood clotting. It is necessary for the conversion of prothrombin to thrombin, which is a key step in the clotting cascade. Calcium also works with vitamin K to help form fibrin strands that are essential for clot formation.

3. **Conclusion:**
- Based on the analysis, the ion that plays the most significant role in blood clotting is **Ca²⁺ (Calcium ion)**.

Therefore, the correct answer is **Option 4: Ca²⁺ (Calcium ion)**.