Patient Care Technician AAH Practice Exam 2026 – Complete Prep

The epicardium is indeed identified as the outer layer of the heart. It serves as a protective layer for the heart and is also involved in the heart’s function, as it contains connective tissue and blood vessels that supply the heart muscle. This layer plays a critical role in providing lubrication to reduce friction between the heart and the surrounding structures, especially as the heart beats.

The other options refer to different layers or aspects of the heart anatomy. The inner layer is known as the endocardium, which lines the chambers of the heart and is essential for smooth blood flow. The muscle layer is referred to as the myocardium, which is the thickest layer responsible for the heart's pumping action. Lastly, the layer surrounding the heart vessels is typically not referred to in terms of the heart's own layers but may include the connective tissues associated with blood vessels rather than a specific layer of the heart itself.