<prompt> Common step in coagulation pathway is -Activation of factor VIIActivation of factor VIIIActivation of factor IXActivation of factor X  <response>: Ans. is d i.e., Activation of factor X o Blood coagulation pathways are divided into:-i Intrinsic pathway contact pathway : It is largely an in vitro9 pathway and is activated when factor XII Hageman factor or contact factor comes in contact with negatively charged surface, e.g. glass, kaolin etc.ii Extrinsic pathway : It is largely an in vivo pathway is activated by tissue factor thromboplastin at the site of tissue injury. 