What is the name of the layer of elastic epithelial tissue that lines the inside of the heart?

The layer of elastic epithelial tissue that lines the inside of the heart is known as the endocardium. This layer plays a crucial role in maintaining the smooth functioning of the heart by providing a frictionless surface for blood to flow over as it moves through the heart chambers. The endocardium is composed of a thin layer of endothelial cells that help regulate various functions, including the contraction of the heart muscle and interaction with blood.

In contrast, the epicardium is the outermost layer of the heart and serves as a protective layer, the myocardium is the thick muscular layer responsible for the heart's contractions, and the pericardium is the fibrous sac surrounding the heart, providing support and protection while allowing for movement. Each of these layers has distinct characteristics and functions, but the endocardium specifically is essential for lining the heart’s interior.