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

c

Explanation:

The pericardium is a thin sac that surrounds your heart. It protects and lubricates your heart and keeps it in place within your chest

The answer is C on edge, a sac around the heart that protects the heart and chest tissue.

Explanation:

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