You know that when you cut yourself the blood flows out of the wound for only a short time.Then the cut fills with a reddish solid material. This is called a blood clot. If blood did not clot,anyone with even a slight wound would bleed too much. Indeed, the blood of certain persons does not clot, a condition known as hemophilia.
The platelets are the particles in the blood responsible for causing it to clot.When blood flows from a cut, it carries platelets. When air comes into contact with the platelets, the oxygen in the air causes the platelets to disintegrate and release a substance that combines with certain substances in the plasma.
This combination forms a substance called fibrin. Fibrin is in the form of a network of tinythreadlike fibres thattrap the cells of the blood to form a dam which holds back the further flow of blood.
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