1. The fluid build-up then causes pressure within the pericardial sac to increase. 2. This pericardial sac is filled with a serous fluid for lubrication. 3. In some cases, conjoined twins have two hearts sheathed in one pericardial sac . 4. The inflammation causes an accumulation of fluid in the pericardial sac , which encases the heart. 5. This tissue is typically harvested from the " Pericardial Sac " of either cows or horses. 6. The fluid can be removed from the pericardial sac using a syringe in a procedure called pericardiocentesis. 7. The avian circulatory system is driven by a four-chambered, myogenic heart contained in a fibrous pericardial sac . 8. The pericardial sac is particularly well suited for a valve leaflet due to its extremely durable physical properties. 9. When air and fluid mix together in the pericardial sac , a tinkling sound superimposed over a succussion splash is heard. 10. "P monacha " is a viviparous species of fish with the young developing in an outgrowth of the female's pericardial sac .
