Skeletal muscles are made up of_____________

Skeletal muscles are made up of_____________

• A. Single-nucleated fibers
• B. Cylindeically shaped cells with many nuclei
• C. Non-striated fibers
• D. Mitochondria-rich adipocytes

Answer: (B)

Skeletal muscles are built from cylindrical, multinucleated cells called muscle fibers. These fibers form when many precursor cells fuse together during development, so each long fiber contains many nuclei along its length. This arrangement supports the large cytoplasm and high levels of protein synthesis needed for powerful, sustained contractions. The fibers are also striated because of the organized arrangement of contractile proteins into sarcomeres. The other descriptions don’t fit skeletal muscle: single-nucleated fibers are typical of smooth muscle, non-striated refers to smooth muscle, and adipocytes are fat cells, not muscle tissue.

Skeletal muscles are built from cylindrical, multinucleated cells called muscle fibers. These fibers form when many precursor cells fuse together during development, so each long fiber contains many nuclei along its length. This arrangement supports the large cytoplasm and high levels of protein synthesis needed for powerful, sustained contractions. The fibers are also striated because of the organized arrangement of contractile proteins into sarcomeres. The other descriptions don’t fit skeletal muscle: single-nucleated fibers are typical of smooth muscle, non-striated refers to smooth muscle, and adipocytes are fat cells, not muscle tissue.