muscle
A muscle is a part of your body that helps you move by stretching and squeezing, which we call contracting and relaxing. Muscles are elastic, they don’t break easily, and they work together with your bones to control movement. Muscles also protect your organs inside the body.
Muscles and Movement
Muscles connect to bones using strong fibers called tendons. When your muscles contract, they pull on your bones, and this is how you move your arms, legs, and other parts of your body. Your brain and nerves help control when and how your muscles move.
How Many Muscles
You have more than 600 muscles all over your body, including muscles like your biceps, abs, quadriceps, triceps, pectorals, glutes, calves, and others.
Muscles Protect
Besides helping you move, muscles keep your important body parts safe by protecting your organs.