Asked by sarah

What is the majority of the mass of the heart composed of?
a. Endocardium
b. Myocardium
c. Pericardium
d. Endothelium
Answered by PsyDAG
Since the heart is a big muscle and "myo-" refers to muscle, guess which one I would choose.
Answered by Anonymous
myocardium
There are no AI answers yet. The ability to request AI answers is coming soon!