The basis of Korotkoff sound is: (A) Aoic valve closure, (B) Production of hea sound, (C) Aerial turbulence, (D) Aerial valve expansion
Answer is C. The sounds of Korotkoff are produced by turbulent flow in the brachial aery. When the aery is narrowed by the cuff, the velocity of flow through the constriction exceeds the critical velocity and turbulent flow results.