<prompt> What is not caused by platelet activating factor?VasoconstrictionBronchodilationCauses platelet aggregationTransmits signals between cells  <response>: Ans. b BronchodilationRef: R 9thpg 89; 8thpg 59PAFProduced by: platelets, basophils, mast cells, neutrophils, macrophages, and endothelial cellsFunctions: platelet aggregation, vasoconstriction and bronchoconstriction. QAt low concentrations it induces vasodilation and increased venular permeabilityTransmits signals between cells 