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Length-passive tension relationship in trabecular (left panel) and papillary muscle (right panel) preparations from the right ventricle of rats from all experimental groups. The points with bars show mean values and standard errors of the mean. The differences are significant (p < 0.05) between the groups: ** - Cd vs. Cont; ^ - Pb + Cd vs. Cont; ^^ - Pb vs. Cd; ## - Pb + Cd vs. Cd.
