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below: Hemostasis or haemostasis (from the Ancient Greek:
αἱμόστασις haimóstasis "styptic (drug)") is a process which
causes bleeding to stop, meaning to keep blood within a damaged
blood vessel (the opposite of hemostasis is hemorrhage). It is
the first stage of wound healing. Most of the time this includes
blood changing from a liquid to a solid state. All situations
that may lead to hemostasis are portrayed by the Virchow's
triad. Intact blood vessels are central to moderating blood's
tendency to clot. The endothelial cells of intact vessels
prevent blood clotting with a heparin-like molecule and
thrombomodulin and prevent platelet aggregation with nitric
oxide