We have about 640 muscles in our bodies. Without muscles we wouldn't be able to breathe, move, digest food, or circulate blood.
Muscles comprise approximately one-third of our body weight.
The muscles under our control are called voluntary muscles. The gluteus maximus in your buttocks. The sartorius muscle attaches to your hip at one end and to your knee at the other end. The fastest working muscles are those located in your eyelids. They cause you to blink about 20,000 times a day.