Question

question skeletal muscle fibers are very unusual because they may be answer devoid of striations and spindle - shaped with a single nucleus capable of division, unlike smooth muscle cells a foot or more in length, and each muscle cell contains hundreds of nuclei subject to the activity of pacemaker cells, which establish contraction rate i dont know yet

Explanation:

To solve this, we analyze each option based on skeletal muscle fiber characteristics:

1. First option: Skeletal muscle is striated, so this is incorrect.
2. Second option: Skeletal muscle cells (myocytes) are multinucleated and do not divide, so this is wrong.
3. Third option: Skeletal muscle fibers can be long (a foot or more) and are multinucleated (each cell has hundreds of nuclei), which matches their structure.
4. Fourth option: Pacemaker cells are related to cardiac muscle, not skeletal, so this is incorrect.

Answer:

The correct option is: a foot or more in length, and each muscle cell contains hundreds of nuclei