Answer: The function of muscle cells is to move your body and helps you Push or Move things, throughout any ways that it is flexible.
Explanation: It is because muscle cells are usually what makes your body operate and to work and move, to you hair to the tip of your toes. These muscles are very strong and make you move whatever weight you are. For example, you are running, the muscles in your feet and legs push you upward and downward and it keeps repeating lick a cycle. When your pushing or pulling things, you can use your strength, or Muscles to use a force on any object.
Hope this helps :).