<prompt> Which of the following is responsible for adhesion of plate!lets to the vessel IN all?.4MS May 2015, November 2013Factor IXVon Willebrand factorFibrinogenFibronectin  <response>: Ans: B. Von Willebrand factorRef. Robbins 9e pill, 660 Robbins 9e p116Von-Willebrand factor:Product of normal endothelial cells.An essential cofactor for platelet binding to matrix elements adhesion of platelets to vessel wall.Events:Endothelial injury allows platelets to contact underlying extracellular matrix a subsequent adhesion occurs through interactions with von Willebrand factor vWF. 