What start blood coltting at the wound?

In a healthy individual blood clots at a wound site to stop bleeding. This process begins with the cells lining the blood vessels causing the clots to form, then proteins create fibrin (which is another type of protein) that acts as glue to hold a blood clot together, and platelets which are small blood cell fragments stick together to form a clot. After the bleeding has stopped and healing has occurred the body breaks down and removes the clot.