Anatomy & PhysiologyQuestion 80 of 100
Which layer of the heart wall is the thick muscular layer responsible for contraction?
a.Pericardium
b.Endocardium
c.Epicardium
d.Myocardium
Explanation
The myocardium is the middle, muscular layer whose contraction generates the pumping force, and it is the tissue damaged in a myocardial infarction. The endocardium is the thin inner lining in contact with the blood. The epicardium is the outer surface layer of the heart, and the pericardium is the surrounding sac.
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