Which of the following blood proteins are involved in blood clotting?

Options

A. Prothrombin and Immunoglobins
B. Prothrombin and Albumins
C. Prothrombin and Fibrinogen
D. Fibrinogen and Globulins

Answer

**Step-by-Step Solution:**

1. **Understanding Blood Clotting:**
Blood clotting is a vital process that prevents excessive bleeding when there is an injury. It involves a series of proteins known as clotting factors that work together to form a mesh-like structure at the site of injury.

2. **Identifying Key Blood Proteins:**
The main proteins involved in blood clotting include:
- **Prothrombin:** An inactive precursor that is converted into thrombin during the clotting process.
- **Fibrinogen:** Another inactive protein that is converted into fibrin, which forms the meshwork of the clot.

3. **Evaluating the Options:**
- **Option 1: Prothrombin and Immunoglobulin**
- Prothrombin is involved in clotting, but immunoglobulin is not; it is involved in immune response.
- **Option 2: Prothrombin and Albumin**
- Prothrombin is involved in clotting, but albumin primarily helps maintain blood volume and fluid balance, not clotting.
- **Option 3: Prothrombin and Fibrinogen**
- Both of these proteins are directly involved in the clotting process.
- **Option 4: Fibrinogen and Globulin**
- Fibrinogen is involved in clotting, but globulin is mainly involved in immune functions.

4. **Conclusion:**
The correct answer is **Option 3: Prothrombin and Fibrinogen**, as both are essential proteins involved in the blood clotting process.