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15 September, 11:29

Pertaining to the heart, what substance acts as a lubricant by reducing friction between opposing surfaces?

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  1. 15 September, 11:55
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    Pericardial fluid

    Pericardial fluid is a serous substance produced by the serous layer of the pericardium into the pericardial cavity. The pericardial fluid reduces friction by lubricating the epicardial surface and allows the two membranes to glide over each other with every heart beat.
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