key term - Endocardium

Definition

The endocardium is the innermost layer of tissue that lines the chambers of the heart and covers its valves. It is composed of a thin layer of endothelial cells that provide a smooth lining for the heart's interior to facilitate efficient blood flow.

Related terms

Myocardium:

The myocardium is the thick middle layer of the heart wall composed of cardiac muscle tissue that contracts to pump blood out of the heart.

Pericardium:

The pericardium is a double-walled sac containing the heart and the roots of its major vessels, serving to protect and lubricate the heart to reduce friction during its movements.

Valves: Heart valves are flap-like structures within the heart that open and close with each heartbeat to regulate one-way blood flow through the heart chambers