Which of the Following is True of the Myocardium

Question

Which of the following is true of the myocardium?
A) Contains thick and thin filaments
B) Contains actin and myosin
C) Is thicker in the left ventricle than in the right ventricle
D) All of the above

Accepted Answer

All of the above options are true. The myocardium is the muscular layer of the heart wall and contains thick and thin filaments composed of actin and myosin. Furthermore, the left ventricle's myocardium is thicker than the right ventricle's myocardium due to its role in pumping blood to the entire body.