A. structures inside the heart that ensure that blood flows in one direction only
B. a sac around the heart that allows the heart muscle to receive oxygen
C. a sac around the heart that protects the heart and chest tissues
D. structures inside the heart that bring blood to the lungs for oxygenation
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Home » Biology » Which best describes the pericardium? A. structures inside the heart that ensure that blood flows in one direction only B. a sac around the heart that allows the heart muscle to receive oxygen C.