Plat and heam Flashcards
1
Q
Functional structure of platelets ?
A
1-cell membranes witch consists of :glycoproteins,phospholipid,highly invaginated forming complex canalicular system
2-cytoplasm consist of: organelles and important structure
2
Q
Physiological function of platelets?
A
It has primary role in heamostasis through 5 function
1- realse of platelets phospholipid=PF3 to start clotting
2-formations of platelets plug
3-stabilize and decrease size of blood clot (retraction)
4-realse of VC substances such as: serotonin,TXA2
5- help repair of damaged vessel (by growth factors)
3
Q
Platelets origin
A
By megakaryocyte fragmentation (megakaryocyte formed under effect of GM-CSF)
platelets released:
30% present in spleen
70% present in blood
4
Q
Half life of platelets
A
8-12 DAYS
