Dicrotic notch is due to closure of: (A) Aoic valve, (B) Mitral valve, (C) pulmonary, (D) Tricuspid valve
Answer is A. Dicrotic notch is due to backflow of blood in the aoa at the beginning of diastole.It marks the end of ventricular systole. Reference:Textbook of medical physiology Geetha,2nd edition,page no:187.