the.com/pericardium
the heart's velvet straitjacket, holding it close enough to beat but never wander.
double layerTwo membranes with slick fluid sliding between them.
fluid cushionRoughly 15 to 50 milliliters of natural lubricant inside.
anchor dutyTethers the heart so it cannot flop around.
angry versionInflamed, it screams sharp chest pain called pericarditis.
deadly squeezeTrapped blood can choke the heart: cardiac tamponade.