Question

fill in the blank question
the layer that lines the inner chambers of the heart is the
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Explanation:

In the study of the heart's anatomy (a topic in Biology, a subfield of Natural Science), the endocardium is the innermost layer that lines the heart's chambers. It consists of endothelial cells and connective tissue, and is involved in maintaining the smooth surface for blood flow and heart function.

Answer:

endocardium