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Plovdiv Entrance Practice Test

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Which layer lines the chambers of the heart?
Correct Answer:
Endocardium
Explanation:
The inner lining of the heart chambers is the endocardium. This layer lines the interior surfaces of all four chambers and covers the heart valves, providing a smooth, frictionless surface for blood to flow over. The heart wall has three layers: the epicardium on the outside, the myocardium in the middle that contracts, and the endocardium on the inside that lines the chambers. The pericardium is the surrounding sac that encloses the heart but does not line the chambers. So endocardium is the correct layer that lines the chambers.

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