Serous membrane surrounding the heart.

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The heart is enclosed in a serous membrane called the pericardium. This sac has an outer fibrous layer and an inner serous layer, which splits into a parietal layer lining the sac and a visceral layer that covers the heart (epicardium). The pericardium’s serous membranes provide a lubricated cavity (the pericardial space) to reduce friction as the heart beats. The other options don’t fit: the endocardium lines the heart’s inner chambers, the peritoneum lines the abdominal cavity, and the epicardium is the outer surface layer of the heart itself (a layer of the heart wall), not the surrounding membrane.