<prompt> platelet activating factor causes all except:VasoconstrictionBronchodilationCauses platelet aggregationtransmits signals between cells  <response>: PAF is another phospholipid derived mediator having the following inflammatory effects: Platelet aggregation Vasoconstriction Bronchoconstriction At extremely low concentration, it may cause vasodilation and increased venular permeability Increases leukocyte adhesion to the endothelium by enhancing integrin-mediated leukocyte binding, chemotaxis, degranulation, and the oxidative burst. Stimulates the synthesis of other mediators, paicularly eicosanoids, by leukocytes and other cells. ref robbins 9e page 89 