Myofibril

Muscle System
Muscle System
Muscle System If you enjoy action, then this is the system for you. No matter how still you try to be, there\'s always a movement taking place in your muscles. Did you know there are over 650 muscles in the human body, and that muscles make up 1/3 of a grown human body? Muscles cover the entire skeleton, and bones can\'t move without muscles. Flex your muscles and tour this exciting system! Three types of muscles are skeletal muscles, smooth muscles, and cardiac muscles. Skeletal muscle tissue c