What is a key function of the fibrous pericardium?

The fibrous pericardium serves several important roles in the structure and function of the heart, and one of its key functions is to prevent over distention of the heart. This tough and dense connective tissue layer surrounds the heart and helps anchor it within the thoracic cavity, providing physical support. By limiting the extent to which the heart can expand, the fibrous pericardium helps maintain optimal cardiac dimensions during the filling phase. This containment is crucial to ensure proper function, as excessive distention could lead to inefficiencies in pumping capacity and potentially cause cardiovascular complications.

In contrast, the other options do not accurately reflect the primary function of the fibrous pericardium. It does not play a role in reducing heart murmurs, controlling heart rate, or oxygenating blood—all of which are functions associated with other structures and mechanisms in the cardiovascular system. By ensuring that the heart does not become over-distended, the fibrous pericardium contributes to the overall stability and health of the heart.