The heart ofLepidurus arcticusconsists of an epicardium and a single layer of strongly polarized myocardial cells, 10–50 μm thick, with the myofibrillar part facing the epicardium. The Z-bands are diffuse and some Z-material forms attachment plaques. Relaxed sarcomeres show a hexagonal arrangement of thick filaments and 6 thin filaments in orbit, but filaments often diverge in their orientati
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