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The heart is enclosed in a double-walled sac called the:
a. apex b. mediastinum c. pericardium d. thorax
The pericardium is a double-walled fibrous sac-like structure that encloses the heart. It acts as mechanical protection and reduces friction between the heart and the surrounding structure. It has three layers, the fibrous pericardium, the parietal pericardium, and the visceral pericardium.
The pericardium is a flexible two-layer "bag" that wraps around the heart. Between the layers of the pericardium is a fluid that allows one layer to slide over the other. The pericardium protects the heart from external harmful influences, such as trauma and infections, but is not a vital organ.
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