Biology, 01.08.2019 09:00 ooorozco

Double-layered sac. the innermost layer of this sac immediately surrounds the heart and is called the pericardium (also called at the base of the heart, this inner layer folds back on itself to become the pericardium. between the layers of this sac is a potential space called the cavity and it is filled with fluid. what is the function of this fluid?

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