Which heart layer forms the outer fibrous sac surrounding the heart?

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Multiple Choice

Which heart layer forms the outer fibrous sac surrounding the heart?

Explanation:
The outer fibrous sac surrounding the heart is the pericardium. This structure forms a protective enclosure around the heart and consists of a tough fibrous layer plus a serous component, creating the pericardial sac that anchors the heart and contains a small amount of lubricating fluid. In contrast, the endocardium lines the interior chambers, the myocardium is the heart’s muscular wall, and the epicardium is the outer surface of the heart itself (part of the serous layer that covers the heart). So the pericardium is what makes up that outer enclosing sac.

The outer fibrous sac surrounding the heart is the pericardium. This structure forms a protective enclosure around the heart and consists of a tough fibrous layer plus a serous component, creating the pericardial sac that anchors the heart and contains a small amount of lubricating fluid. In contrast, the endocardium lines the interior chambers, the myocardium is the heart’s muscular wall, and the epicardium is the outer surface of the heart itself (part of the serous layer that covers the heart). So the pericardium is what makes up that outer enclosing sac.

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