Question

which structures are highlighted? skeletal muscle fibers striations intercalated discs nuclei

Explanation:

Skeletal muscle fibers are long, cylindrical cells with multiple nuclei located peripherally. Striations are the alternating light and dark bands (due to actin and myosin filaments) that give skeletal and cardiac muscle their striped appearance. Intercalated discs are found in cardiac muscle, connecting adjacent cardiac muscle cells. Nuclei are the cell's control centers. The highlighted area shows the alternating light and dark bands characteristic of striations.

Answer:

striations