![]() ![]() The epicardium covers the heart, wraps around the roots of the great blood vessels, and adheres the heart wall to a protective sac. The outermost layer is the epicardium (or visceral pericardium). The muscular wall of the heart has three layers. The Heart Wall Is Composed of Three Layers Two valves control blood flow within the heart’s chambers, and two valves control blood flow out of the heart. One chamber on the left receives oxygen-rich blood from the lungs and another pumps that nutrient-rich blood into the body. One chamber on the right receives blood with waste (from the body) and another chamber pumps it out toward the lungs where the waste is exhaled. This key circulatory system structure is comprised of four chambers. ![]() The heart is a hollow, muscular organ that pumps oxygenated blood throughout the body and deoxygenated blood to the lungs. ![]()
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