Final answer:
Intercalated discs and striations are found only in cardiac muscle cells, not skeletal muscle cells.
Step-by-step explanation:
Intercalated discs and striations are found in cardiac muscle cells, not skeletal muscle cells. Cardiac muscle cells have striations and also contain intercalated discs, which are specialized regions that join adjacent cardiac muscle cells and assist in passing an electrical impulse from cell to cell. Skeletal muscle cells, on the other hand, have striations but do not have intercalated discs.