<prompt> Y descent of the IVP is due to:Atrial relaxationClosure of the right ventricleOpening of the triscuspid valveOpening of the left ventricle  <response>: Opening of the tricuspid valve: Ref: 1306-H, 569-G 1384-HI7th 512- Ganong 23rdJugular venous pulse: JVP Positive presystole a wave is produced by venous distension due to right atrial contraction and is the dominant wave in the JVP. Large a wave indicates that the right atrium is contracting against an increased resistance Tricuspid stenosis, pulmonary hypertension or PS Large a-wave also occurs during arrhythmias whenever the right atrium contracts while the tricuspid valve is closed by right ventricular systole. C-wave - produced by the bulging of the tricuspid valve into the right atrium during right ventricular isovolumetric systole and by the impact of the carotid artery adjacent to the jugular vein X-descent is due to both to atrial relaxation and to the downward displacement of the tricuspid valve during ventricular systole V wave results from the increasing volume of blood in the right atrium during ventricular systole when the tricuspid valve is closed. Y descent produced mainly by the opening of the tricuspid valve and the subsequent rapid inflow of blood in the right ventricles. Tricuspid regurgitation 