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  2. Heart rate - Wikipedia

    en.wikipedia.org/wiki/Heart_rate

    A medical monitoring device displaying a normal human heart rate. Heart rate is the frequency of the heartbeat measured by the number of contractions of the heart per minute (beats per minute, or bpm).

  3. Frank–Starling law - Wikipedia

    en.wikipedia.org/wiki/Frank–Starling_law

    Cardiac function curve.In diagrams illustrating the Frank–Starling law of the heart, the y-axis often describes the stroke volume, stroke work, or cardiac output.The x-axis often describes end-diastolic volume, right atrial pressure, or pulmonary capillary wedge pressure.