which double walled membranous bag protects the heart
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ab heart is surrounded by a double wall membrane called pericardium.
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It's pericardium which protects your heart and this pericardium has two layers
Outer parietal Pericardium
Inner Visceral Pericardium
A space is present between both called Pericardial Fluid ...
It's helps us to prevent heart from outer stroke
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