The pericardium is:
a. the outer muscular layer of the heart.
b. the innermost layer of the heart chambers.
c. a membranous sac that encloses the heart.
d. the heart's fibrous skeleton.
ANS: C
The pericardium is the membranous sac that surrounds the heart. The outer layer that acts as the fibrous skeleton of the heart is the myocardium. The innermost layer of the heart is the endocar-dium.
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