Assertion: circulatory system's heart | /r/HasProperty | myocardium
Facets:
Source sentences:
text: The muscular layer of the heart (myocardium) in the atria has two layers of striated muscle, and in the ventricles - five layers.
text: A condition called stress cardiomyopathy entails a sudden, temporary weakening of the muscle of the heart (the myocardium).