The muscular layer of the heart wall, responsible for its contraction, is the
- A. epicardium
- B. pericardium
- C. myocardium
- D. endocardium
Explanation
The myocardium is cardiac muscle supplied by the coronary arteries, and its death during a heart attack is what damages the pump. The endocardium lines the chambers and the epicardium is the outer surface.