Which muscle layer is located on the inner surface of the heart?

The endocardium is the layer that lines the inner surface of the heart. It is comprised of endothelial cells and connective tissue, providing a smooth surface for blood to flow over as it moves through the heart's chambers. This smooth lining is crucial for reducing friction and preventing blood clots within the heart.

Understanding the function of the endocardium helps highlight its importance in maintaining proper cardiovascular health. The myocardium, on the other hand, is the thick muscular layer responsible for the heart's contractions, while the epicardium serves as the outer layer of the heart wall. The pericardium is the protective sac surrounding the heart itself. Each of these layers has distinct roles, but the endocardium specifically is essential for the inner lining and functionality of the heart chambers.