Many animals, from people to lobsters, rely on circulatory systems of fundamentally similar design. These systems consist of a pumping organ and a set of conduits that circulate the blood. In all cases, the pump is powered by cyclical contractions of linear motors, or muscle. Consequently, the flow of blood into the arterial tree is very pulsatile. During each cardiac cycle, the blood's pressure and flow velocity rise and fall with these regular contractions.
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