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Posted by on Saturday, January 26, 2013 at 8:05pm.

What is the majority of the mass of the heart composed of?
a. Endocardium
b. Myocardium
c. Pericardium
d. Endothelium

  • BIOLOGY - , Sunday, January 27, 2013 at 12:01pm

    Since the heart is a big muscle and "myo-" refers to muscle, guess which one I would choose.

  • BIOLOGY - , Friday, January 22, 2016 at 10:59am

    myocardium

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