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Isochronal map of a canine cardiac myocyte at the onset of flash-triggered oscillations. The red square signifies the area of the flash. About 25 s after the flash, an initial critical mass of mitochondria in the left bottom area of the myocyte triggers mitochondrial depolarizations by exciting a critical number of mitochondria. The excitation penetrates the whole myocyte within ≈10–12 s, leading to a conduction velocity of about 32 μm/s.
