AQA A Level PE – The Cardiovascular System Practice Test

What is the function of the endocardium?

Lines the chambers and valves Forms outer surface and anchors Produces heart sounds Pumps blood

Correct Answer:

Lines the chambers and valves

Explanation:

The endocardium is the inner lining of the heart. It lines the chambers and covers the heart valves, providing a smooth, low-friction surface for blood to flow and helping protect the heart tissue from wear as blood moves through the heart. It’s continuous with the endothelium that lines all blood vessels. The pumping action comes from the muscular heart wall (myocardium), not the endocardium, and heart sounds come from valve closures and blood flow, not from this inner lining.

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