<prompt> c wave of JVPOccurs during rapid filling phase of cardiac cycleOccurs due to opening of tricuspid valveOccurs due to closure of tricuspid valve into right atriumOccurs at the end of T wave  <response>: c wave of JVPOccurs due to bulging of tricuspid valve into right atriumOccurs during isovolumetric contraction phaseIn tricuspid regurgitation, v wave merge with c wave. 