<prompt> Platelate aggregation is caused by all, except -Thromboxane A2SerotoninProstacyclin PGI2Thrombin  <response>: Ans. is C i.e.. Prostacyclin PGI, o Factors promoting platelet aggregation : ADP, TXA2 epinephrine, serotonin, vWF, fibrinogen, collagen, immune complex, thrombin, thrombospondin. a Factors inhibiting platelet aggregation : PGI2, NO, endothelin, bradykinin. 