What is one role of the fibrous pericardium?

• A. Anchors the heart in the mediastinum and prevents overfilling.
• B. Pumps blood through the circulatory system.
• C. Produces the heart sounds.
• D. Forms the heart valves.

Answer: (A)

The fibrous pericardium serves as a sturdy, outer sac that provides structural support for the heart. It anchors the heart in the mediastinum and helps keep it in place as you move and as surrounding structures shift with breathing. It also limits how much the heart can stretch when venous return increases, preventing overfilling and protecting the heart from distension. This combination of anchoring and restraint is its defining role, which is why this description fits best. Remember, pumping blood is done by the heart muscle (myocardium), heart sounds come from valve closures and blood flow, and valves are formed by endocardial tissue, not the fibrous pericardium.