What are the three layers of the heart wall?

What are the three layers of the heart wall?

• A. Epicardium, Myocardium, and Endocardium
• B. Pericardium, Epicardium, and Endocardium
• C. Endocardium, Myocardium, and Pericardium
• D. Epicardium, Pericardium, and Endocardium

Answer: (A)

The heart wall is built from three concentric layers: the outer epicardium, the middle myocardium, and the inner endocardium. The epicardium, also known as the visceral layer of the serous pericardium, covers the heart’s surface and provides protection with connective tissue and some fat. The myocardium is the thick, muscular layer that contracts to pump blood. The endocardium lines the interior of the heart chambers and covers the heart valves, continuing as the endothelium that lines all blood vessels. The pericardium surrounds the heart as a protective sac but is not part of the heart wall itself. So, epicardium, myocardium, and endocardium correctly describe the heart wall layers.

The heart wall is built from three concentric layers: the outer epicardium, the middle myocardium, and the inner endocardium. The epicardium, also known as the visceral layer of the serous pericardium, covers the heart’s surface and provides protection with connective tissue and some fat. The myocardium is the thick, muscular layer that contracts to pump blood. The endocardium lines the interior of the heart chambers and covers the heart valves, continuing as the endothelium that lines all blood vessels. The pericardium surrounds the heart as a protective sac but is not part of the heart wall itself. So, epicardium, myocardium, and endocardium correctly describe the heart wall layers.