The turbulence of blood flow will cause the murmur or the bruit and not the sound. The co-relation of Korotkoff’s sound with the first heart sound was studied with the above methods .After study and clinical co-relation bring me to the above conclusion that the Korotkoff’s sound coincides with the first heart sound. Hence the origin of Korotkoff’s sound is in the heart that is the closure of the mitral valve.