Which cardiac structure is responsible for the heart's pumping action?
a. Pericardium
b. Epicardium
c. Myocardium
d. Endocardium
C
The myocardium is the thick muscular middle layer responsible for the pumping action of the heart. The pericardium is the tough, double-walled, fibrous sac that protects the heart. The epi-cardium is the thin outermost muscle layer that covers the heart and extends onto the great ves-sels. The endocardium is the innermost layer that lines the chambers of the heart and covers heart valves.
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