Multiple choice

Which of the following statements is incorrect about the mechanism of blood clotting?

  1. Blood platelets burst when they come in contact with environment.

  2. Thromboplastin forms prothrombinase, which activates heparin.

  3. Thrombin acts as a proteolytic enzyme and converts fibrinogen into fibrin monomers.

  4. The fibrin monomers polymerise to form long threads.

  5. The clot seals the wound and the platelets entrapped in the clot release more thromboplastin.
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B Correct answer
Explanation

Thromobplastin forms an enzyme prothrombinase that inactivates heparin andconverts inactive plasma protein; prothrombin into thrombin, which converts fibrinogen into fibrin monomers that polymerise to form long threads to clot the blood.

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