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Results from ramp-hold experiments performed on explanted HH stage 10–11 avian hearts. Pressure of micropipette applied to the tissue increases with increments of 0.13 kPa every 46 s. Excursion length differences as a function of pressure (indicated colors) and time after a pressure ramp (axis) are plotted. The best-fit standard linear solid (SLS) model is shown in black. For the majority of pressures applied, the heart behaves quantitatively as a linear viscoelastic material.
