The Muscular System
The muscles provide the forces that enable the body to move. Muscles stretch across joints to link one bone with another and work in groups to respond to nerve impulses. There are three types of muscle: skeletal, smooth and cardiac. Muscles provide strength, balance, posture, movement and heat for the body to keep warm. Muscles are very important because without muscles we would not be able to move or anything. The muscle system is very complicated and unique throughout each phylum.