A medical device that records the movement of the body caused by the heart pumping blood, used to assess cardiac function.
From 'ballisto-' (ballistic movement) + 'cardio-' (heart) + '-graph' (recording instrument). Created in the 1940s as an alternative cardiac diagnostic tool.
This machine proved that Newton's Third Law applies to your heart—every beat pushes blood forward, causing your whole body to recoil backward by millimeters.
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