Assertion: cardiac muscle's muscle cell | /r/AtLocation | the walls of hollow organs
Facets:
Source sentences:
text: Smooth muscle cells are found in the walls of hollow organs, including the stomach, intestines, urinary bladder and uterus, and in the walls of passageways, such as the arteries and veins of the circulatory system, and the tracts of the respiratory, urinary, and reproductive systems.