<prompt> V Wave in JVP is due to-Right atrial contractionRight atrial relaxationClosure of tricuspid valveIsovolumetric relaxation  <response>: Ans. is c i.e., Closure of tricuspid valveJugular venous pressure JVP The variations in right atrial pressure are transmitted to the jugular veins, producing three positive waves a, c and v and two negative wavesdescents x and y.1 a-wave : It is presystolic positive wave due to right atrial contraction right atrial systole.2 x-descent: It a negative wave due to right atrial relaxation.3 c-wave: This positive wave is produced by bulging of tricuspid valve into right atrium during isovolumetric contration of right ventricle.4 v-wave: It positive systolic wave resulting from increase in blood volume in vena cava during systole, when tricuspid valve is closed.5 y-descent diatolic collapse: This negative wave is due to tricuspid valve opening and rapid inflow ofbood into right ventricle. 