<prompt> Dicrotic notch corresponds to?Closure of AV valvesClosure of Aortic and pulmonic valvesOpening of AV valvesOpening of Aortic and pulmonic valves  <response>: Ans. b Closure of aortic and pulmonic valvesRef.: Ganottg 25th ed. 1540The Dicrotic notch is small oscillations on the falling phase of the pulse wave caused by vibrations set up when the aortic valve snaps shut. 