Question

Which of the following is not true?

• A. Thrombin converts the fibrinogen in the plasma to prothrombin.
• B. Thromboplastin converts prothrombin in the plasma to thrombin.
• C. Tissues degenerate to form the enzyme called thromboplastin.
• D. A blood clot is formed by the entangling of platelets and red blood cells in the fibrin network.

Answer 1

The correct option is A

Thrombin converts the fibrinogen in the plasma to prothrombin.

When wounds occur, if not closed, they cause blood loss. The wounded tissue degenerates to form an enzyme known as thromboplastin. Thromboplastin converts prothrombin, which is synthesized by calcium ions and vitamin K, into thrombin. The thrombin further converts the fibrinogen in the plasma to fibrin. The fibrin forms a network on the wound. A blood clot is formed by the platelets and RBCs entangling in the fibrin network.