The given diagram shows a method used by Alina to measure the blood pressure of herclassmate. She heard a sound during phase II and noted the blood pressure as 120/80 mmHg (millimetres of mercury).She infers that the sound was audible during phase II because the
Correct answer: A. Blood flow in the brachial artery becomes turbulent, creating audible sounds
- A. Blood flow in the brachial artery becomes turbulent, creating audible sounds
- B. The diameter of the lumen of the brachial artery gets minimized
- C. The pressure in the cuff is greater than the pressure in the artery
- D. Enough air pressure is pumped into the cuff to close the artery
Explanation
During blood pressure measurement, sounds are heard as blood starts to flow through the compressed artery and becomes turbulent. This typically occurs during phase II, known as the Korotkoff sounds, when the cuff's pressure is between the systolic and diastolic pressures. The correct option is that blood flow in the brachial artery becomes turbulent, creating audible sounds. The other options are incorrect as they either describe different phases or do not account for the turbulent flow that causes the sound.
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Blood vessels include arteries, arterioles, capillaries, venules and veins, whose wall thickness, elasticity, lumen size and valves suit their roles in circulation. Questions compare pressure and blood flow in each vessel and distinguish pulmonary vessels, which carry blood to and from the lungs, from systemic vessels.
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