<prompt> In lypoxygenase pathway of the arachidonic acid metabolism, which of the following products help to promote the platelets aggregation and vaso constrictionC5aThromboxane A2Leukotriene B4C1 activators  <response>: ref Robbins 9e p84 Thromboxane A2 TXA2 is a type of thromboxane that is produced by activated platelets during hemostasis and has prothrombotic propeies: it stimulates activation of new platelets as well as increases platelet aggregation 