American Society for Clinical Pathology (ASCP) Histotechnician Certification Practice Exam

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Prepare for the ASCP Histotechnician Certification Exam with practice questions and detailed explanations. Enhance your knowledge and skills to excel in the exam.

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What is the outer layer of the heart called?

Endocardium
Myocardium
Epicardium
Pericardium

The correct answer is: Epicardium

The outer layer of the heart is called the epicardium. This layer serves as a protective covering for the heart and is also part of the pericardial sac, which includes the pericardium itself. The epicardium is composed of a layer of mesothelial cells that is underlined by connective tissue. It plays a crucial role in providing a smooth surface for the heart within the pericardial cavity, which reduces friction as the heart beats. The endocardium is the inner lining of the heart chambers, providing a smooth surface for blood flow. The myocardium is the thick muscular layer responsible for the heart's contractile function. The pericardium, on the other hand, is the fibrous sac that encases the heart and contains the fluid that lubricates the heart's movement. Understanding these different layers and their functions is key to recognizing the structural composition of the heart.