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Bubba found a stethoscope and decided to play with it. Bertha found Bubba with the stethoscope in his ears and the diaphragm correctly placed over the antecubital portion of his forearm. When she asked him what he could hear, he replied “I can hear the 'lub dub' of my blood pressure." State two different reasons why Bertha knows Bubba is faking. (2)
Answer:The 'lub-dub' sound of the heartbeat is caused by the rhythmic closing of the heart valves as blood is pumped in and out of the chambers and you can't hear anything using a diaphragm
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