How blood clotting works

Blood clots when it is exposed to air. This property of blood prevents loss of blood.It also seals up cuts and wounds,thus preventing harmful microbes from entering the body through them.
The clotting process is a complex one.Briefly, when blood is exposed to air, the platelets break up and release thromboplastin, an enzyme. In the presence of calcium ions, thromboplastin converts a plasma protein prothrombin to the enzyme, thrombin. Thrombin causes another soluble plasma protein, fibrinogen, to change to insoluble threads of fibrin. The fibrin threads entangle the blood cells and the whole mass forms a clot that seals the cut.

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