Hemostasis

Thursday, October 8, 2009

Hemostasis is the process by which blood changes from a fluid to a solid state, stopping the hemorrhage through a damaged blood vessel. In other words, hemostasis is the arrest of bleeding by a natural process. But major arterial bleeding is unlikely to be stopped by this process; in this case it requires a surgical process. The process of hemostasis has three steps: 1) vasoconstriction; 2) temporary blockage of a break by a platelet plug; and 3) blood coagulation, which is the formation of a clot that seals the hole until the tissue is repaired.