Membrane surrounding the heart.
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Answer:
A double-layered membrane called the pericardium surrounds your heart like a sac. The outer layer of the pericardium surrounds the roots of your heart's major blood vessels and is attached by ligaments to your spinal column, diaphragm, and other parts of your body.
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Explanation:
double layered membrane also carried out by surrounding pericardium like whole heart is covered by double layered membrane
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