heart pericardium 2.Exposing the heart Hold the cardiac pericardium with forceps and carefully remove the membrane from the heart with scissors. The heart is then periodically moistened with Ringer's solution.pericardium heart 2.Exposing the heart  Hold the cardiac pericardium with forceps and carefully remove the membrane from the heart with scissors.  The heart is then periodically moistened with Ringer's solution