Assume that you are looking at cell cultures, from the lining of the stomach, the wall of the heart, and a leg muscle, but the slides are not labeled. How can you identify each cell structure?
It is simple columnar epithelium with one nucleus in every cell (which will appear as a rectangular pink structure inside which there is a purple circle).
The cardiac muscle histology will show striations (stripy appearance), cells are short and contain one or two nuclei at the center of the cell, and the cells are tightly connected at dark-staining junctions called intercalated discs.
The skeletal muscle histology will show striations (stripy appearance), cells are long, and contain multiple nuclei that are peripheral.