The enzyme complex formed by cascade reactions during blood clotting is called

Options

A. thrombin
B. fibrin
C. prothrombinase
D. thromboplastin

Answer

To answer the question regarding the enzyme complex formed by cascade reactions during blood clotting, follow these steps:

1. **Understand the Blood Clotting Process**: Blood clotting, or coagulation, is a complex process that involves a series of biochemical reactions. These reactions lead to the formation of a stable blood clot to prevent excessive bleeding.

2. **Identify Key Components**: In the coagulation cascade, several factors are involved, including prothrombin, thrombin, fibrin, and various cofactors. It’s important to know the roles of these components.

3. **Focus on the Enzyme Complex**: The question specifically asks for the enzyme complex formed during the cascade reactions. This complex is crucial for converting prothrombin into thrombin.

4. **Recognize the Role of Prothrombinase**: The enzyme complex that catalyzes the conversion of prothrombin to thrombin is known as prothrombinase. It consists of activated factor X (Xa), its cofactor factor V, phospholipids, and calcium ions.

5. **Select the Correct Option**: Based on the information gathered, the correct answer to the question is option 3: prothrombinase.

**Final Answer**: The enzyme complex formed by cascade reactions during blood clotting is called prothrombinase.

---