What is the pericardium?

The pericardium is indeed a fluid-filled sac surrounding the heart. This double-walled structure serves several important functions. It provides a protective barrier for the heart, reducing the risk of trauma, and it also contains a small amount of fluid that lubricates the heart, allowing it to move more freely as it beats. Additionally, the pericardium helps to anchor the heart within the thoracic cavity while allowing for some movement as the heart expands and contracts.

Understanding the pericardium's role is essential in recognizing how it maintains heart health and function, distinguishing it from other components of the cardiovascular system, such as muscles, chambers, or blood vessels.