The document summarizes the mechanism of blood clotting. When an injury occurs, platelets gather at the site and become sticky, forming a temporary plug. Prothrombin is converted into thrombin with the help of ion calcium. Thrombin then converts fibrinogen into fibrin threads, which form a mesh-like clot that traps red blood cells and later hardens into a scab.

3. Red blood cell

7. Mechanism of blood clotting
Wound in skin
Forms a temporary plug
in leaking Platelet gather  Sticky
vessel
Produce
Trombokinase
Need
Vitamin D
Fibrinogen Trombokinase
Thrombin Prothrombin
Ion Calcium
Fibrin
Later
Forms the threads
of the clot Harden (scab)

8. Wound in skin
Whenever an injury occurs a chain reaction is set off.

9. Wound in skin
Platelet
Platelets gather at a site of the injury and become
sticky

10. Wound in skin
Forming a temporary plug in the leaking vessel

11. Vitamin K
Trombokinase
Thrombin Prothrombin
Ion Calcium
Prothrombin (non-active enzyme) need ion
calcium to convert into thrombin.

12. Thread of clot
Thrombin converts soluble fibrinogen
(plasma protein formed by the liver) into
insoluble fibrin. Fibrin forms the threads of
the clot

13. A mesh-like network of
fibrin traps red blood cells
together, forming the blood
clot, which later hardens
into a scab.