A South Florida appeals court heard arguments in a challenge to the constitutionality of the state’s workers’ compensation insurance system, as two other closely watched challenges also await rulings at the Florida Supreme Court.

The Third District Court of Appeal on Monday took up a case in which a Miami-Dade County circuit judge ruled last year that a key underpinning of workers’ compensation laws was unconstitutional. That underpinning involves cases being handled through the workers’ compensation insurance system instead of through civil lawsuits.