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Fig. 4. (A) Stretch of single rat (top) and single trout (bottom) ventricular
myocytes held between carbon fibres with resting and stretched sarcomere
length (SL) shown on the image. Scale bars, 10 µm. (B) Mean SL–
active tension relationships for trout (blue) and mammalian (red) ventricular
myocytes where 1.0=1.84±0.02 µm for x-axis and
1.0=0.19±0.03 nN µm–2 for y-axis. The red
square (ferret) and red triangle (rat) are data extrapolated to the peak of
the mammalian length–tension relationship (2.2 µm). Boxes show the
operating range of SLs over which each species act and the corresponding
changes in force [adapted from Shiels et al.
(Shiels et al., 2006)].
Mammalian data (rat and ferret) are replotted from Cazorla et al.
(Cazorla et al., 2000a).
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