Protein required for coagulation of blood is

Options

A. Haemoglobin
B. Globulin
C. Fibrinogen
D. Albumin.

Answer

**Step-by-Step Solution:**

1. **Understanding Blood Coagulation**: Blood coagulation is the process by which blood changes from a liquid to a gel, forming a blood clot. This is crucial for stopping bleeding when injuries occur.

2. **Identifying the Proteins**: The question asks for the specific protein involved in blood coagulation. Several proteins are present in the blood, but not all are involved in clotting.

3. **Evaluating the Options**:
- **Hemoglobin**: This protein is found in red blood cells and is responsible for transporting oxygen and carbon dioxide. It does not play a role in blood coagulation. **(Incorrect)**
- **Globulin**: This is a group of proteins in the blood that play roles in immune function and liver function. However, it is not directly involved in the coagulation process. **(Incorrect)**
- **Fibrinogen**: This is a soluble plasma protein produced by the liver. It is crucial for blood coagulation as it is converted into fibrin, which helps form the blood clot. **(Correct)**
- **Albumin**: This protein helps maintain osmotic pressure in the blood but is not involved in coagulation. **(Incorrect)**

4. **Conclusion**: The protein required for the coagulation of blood is **fibrinogen**. It is converted into fibrin during the clotting process, which, along with platelets, forms the blood clot.

**Final Answer**: The protein required for coagulation of blood is **fibrinogen**.

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