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Reentry of action potential generated by the heterogeneous structure of the tissue in the discrete model. (a) Generation of the traveling wave in the bottom part of the tissue (t = 10 ms). (b) Wave rapidly propagates to the upper part of the tissue transversely to the fibers direction (t = 80 ms). (c) A piece of the wave reenters into the tissue (t = 150 ms). (d) New waves are generated and eventually a repeated reentry is formed mimicking a spiral wave (t = 220 ms).
