Question

Sam was bleeding from a small scrape on his knee. Few days later he noticed that his scrape was covered up and was regaining to it's normal state of skin. Choose the correct sequence to make him understand the process of blood clotting.

(1) Tissues degenerate to form the enzyme called thromboplastin.
(2) A blood clot is formed by the entangling of platelets and red blood cells in the fibrin network.
(3)Conversion of prothrombin in the plasma to thrombin.
(4) Conversion of fibrinogen in the plasma to fibrin.

• A. 1 $\to$ 4 $\to$ 3 $\to$ 2
• B. 1 $\to$ 3 $\to$ 4 $\to$ 2
• C. 3 $\to$ 1 $\to$ 4 $\to$ 2
• D. 1 $\to$ 3 $\to$ 2 $\to$ 4

Answer 1

The correct option is B 1 $\to$ 3 $\to$ 4 $\to$ 2

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.