The Fibrous Pericardial Sac is Lined with a Serous Membrane

Question

The fibrous pericardial sac is lined with a serous membrane.

Accepted Answer

The fibrous pericardial sac is lined with a serous membrane called the parietal layer of the serous pericardium, which is continuous with the visceral layer covering the heart. Together, they form the pericardial cavity containing a small amount of fluid that reduces friction during heartbeats.