Ace the CTBS Exam 2025 – Unleash Your Inner Tissue Bank Specialist!

Question: 1 / 400

What is the external most layer of the heart muscle called?

Myocardium

Endocardium

Pericardium

Epicardium

The external most layer of the heart muscle is known as the epicardium. This layer serves as the outer protective covering of the heart. It is composed of a thin layer of connective tissue and is part of the heart wall. The epicardium plays a role in providing structural support and a smooth surface for the heart, allowing for efficient movement and reducing friction with surrounding structures as the heart pumps.

In contrast, the myocardium is the thick muscular middle layer responsible for the contraction of the heart, while the endocardium lines the interior chambers and valves of the heart. The pericardium, on the other hand, is a fibrous sac that surrounds the entire heart, providing additional protection and stability, but is not part of the heart muscle itself. Understanding these distinctions clarifies why the epicardium is correctly identified as the outermost layer of the heart.

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