What is the sac that surrounds and protects the heart is called?

Question

Quizplus · Accepted Answer

The pericardium is a tough, fibrous double-walled sac that surrounds and protects the heart. It has two layers that contain a few milliliters of serous pericardial fluid. The myocardium is the muscular wall of the heart. The endocardium is the thin layer of endothelial tissue that lines the inner surface of the heart chambers and valves. The pleural space is the space between the visceral and parietal pleura of each lung. The sac that surrounds and protects the heart is the pericardium.

What Is the Sac That Surrounds and Protects the Heart