. . "coraz\u00F3n" . . . "0" . . . . . . . . . . . . . . . "\u00F3rgano muscular oco situado detr\u00E1s do esterno e entre os pulm\u00F3ns. as s\u00FAas contracci\u00F3ns r\u00EDtmicas mover o sangue a trav\u00E9s do corpo." . . . . . . . .