Question

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multiple choice question
which is the innermost layer of the heart wall?
myocardium
epicardium
endocardium

Explanation:

The heart wall has three layers: epicardium (outer), myocardium (middle), and endocardium (innermost). Endocardium lines the inner chambers. Myocardium is the muscular middle layer, epicardium is the outer layer. So the innermost is endocardium.

Answer:

C. Endocardium (assuming the options are labeled as A. Myocardium, B. Epicardium, C. Endocardium; if the original options have different labels, adjust the identifier but the text is Endocardium)