The thin, transparent membrane that covers the outer surface of the heart and the inner surface of the pericardium, secreting fluid that reduces friction.
From Greek epi- (upon) + Latin cardium (from Greek kardia, heart). The term was coined to describe this specific cardiac membrane layer.
Your epicardium is like a slip-and-slide system for your heart—it produces lubricating fluid so your heart can beat millions of times without friction wearing it out!
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