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What was the ballistocardiograph, as described by the source?
AA surgical tool used to repair damaged heart valves
BA modern imaging technique using ultrasound to see the heart
CA device for measuring a patient's blood pressure directly
DA diagnostic device measuring the reaction force from each heartbeat
Answer & Solution
Correct answer: D. A diagnostic device measuring the reaction force from each heartbeat
1. Each heartbeat forces blood into the aorta, and by Newton's third law, an equal and opposite reaction force acts on the rest of the body.
2. The ballistocardiograph is a device built to measure this reaction force.
3. It notes this technique was used in the second half of the twentieth century to study heart strength and blood volume.
4. The source contrasts it with the electrocardiogram and echocardiogram, which are the more widely used modern techniques, one electrical and the other based on ultrasound imaging.
_Source: OpenStax College Physics (CC BY 4.0), Ch 8 "Linear Momentum and Collisions", section 8.3 Conservation of Momentum_
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