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23-02-2008, 04:06 مساء
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hemostasis
hemostasis is the stoppage of bleeding (differs from homeostasis)
mechnisms of hemostasis: 1- vascular spasm: the blood vessel wall contracts immedaitely after rupture due to nervous reflex , local myogenic contraction , and the effect of serotonin released from aggregated blood platelets . 2- the formatiom of platelet plug: following injury , collagen fibers at the end of the vessel wall have a very special role in platelets adhesion . platelets adhere to each other and form hemostatic plug. adhesion diphosphate (ADP) in the primary chemical agent released from blood platelets and hemolysed red cells responsible for platelets aggregation . 3- blood coagulation: it is the conversion of soluble fibrinogen into insoluble meshwork of fibrin , threads entrapping blood cells and plasma .
__________________
warning ourself from the future is an important factor for success  ]
آخر تعديل بواسطة dr.kingmostafa27 ، 23-02-2008 الساعة 04:10 مساء. 
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