Why heart is covered with pericardial membrane
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The pericardium membrane is smooth and acts as a cushion, it protects the heart so that bones of rib could not damage the heart when it contracts.
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The pericardial sac has two layers, a serous layer and a fibrous layer. It encloses the pericardial cavity which contains pericardial fluid. The pericardium fixes the heart to the mediastinum, gives protection against infection and provides the lubrication for the heart.
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