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The heart is a pump that generates pressure and flow. It can be compared with other hydraulic pumps that are usually characterized by their head (pressure) – capacity (flow) curve. As an example consider a roller pump and make a pressure-flow relation by changing the load on the pump.
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Westerhof, N., Stergiopulos, N., Noble, M.I.M. (2010). The Pump Function Graph. In: Snapshots of Hemodynamics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-6363-5_14
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