The Korotkoff sounds that are listened for during a blood pressure measure- ment by the auscultatory method are caused by: A. turbulent blood flow in the aorta B. the difference between systolic pressure and cuff pressure. C. turbulent flow in the collapsed brachial artery D. the opening and closing of the heart valves
Option C. Squashing the brachial artery will cause blood go with the flow to be turbulent because it passes thru the constriction. This turbulence creates sound that can be detected with a stethoscope.
