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Pericardium is a membrane present around the heart...it contains fluid...which prevents from getting shock

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The pericardium  the sac-like membrane that surrounds and protects the heart.The pericardium secures the heart in the chest by preventing excessive movement, especially when the position of the body changes. The pericardium also protects the heart from infections in neighboring tissues, and prevents the heart from overfilling with blood...
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