haemostasis The prevention of blood loss following rupture of blood vessels, which is effected by several physiological processes. Initially, bleeding is restricted by constriction of the damaged vessels, whose endothelial surfaces also stick together. The damage to the vessel endothelium exposes collagen, which attracts platelets to the site. These become sticky and release arachidonic acid, which is converted to thromboxane A2. This attracts other platelets to the site, so that a plug forms. Neighbouring undamaged areas continue to release prostacyclin, which inhibits platelet aggregation and so prevents unnecessary enlargement of the plug. The various stages of blood clotting then ensue.
More From encyclopedia.com
Transfusion , Transfusion Definition Purpose Demographics Description Preparation Aftercare Risks Normal results Morbidity and mortality rates Alternatives Definit… Blood Transfusion , blood transfusion Blood, moved between bodies, has long been thought to rejuvenate its recipient. Though transfusion ‘proper’ — moving blood directly… Blood Donation And Registry , Blood donation, also called blood banking, refers to the process of collecting, testing, preparing, and storing whole blood and blood components inte… Blood Plasma , blood plasma The almost colourless fluid that remains when all corpuscles have been removed from blood (present as a suspension after centrifugation… fibrinogen , fibrinogen A soluble blood protein that is acted upon by the enzyme thrombin during blood clotting to give the insoluble protein fibrin. See also BLO… Thrombophlebitis , Thrombophlebitis Definition Thrombophlebitis is the inflammation of a vein with blood clot formation inside the vein at the site of the inflammation.…
About this article
All Sources -
Updated Aug 08 2016 About encyclopedia.com content Print Topic
You Might Also Like