How do bones and muscles work?

Bones are part of the skeletal system, which are rigid support structures within the body, giving the body form and supporting it under its own weight. Bones are connected together via flexible, yet strong, fibers called ligaments, which allow the bones to move with certain degrees of freedom, but yet remain connected together.
Attached to bones are also tendons, which are strong, fibrous connections that link muscle to bone.
The central nervous system sends signals down nerve pathways to muscles, causing them to contract and relax at specified intervals. The contraction and relaxation of muscle in varying patterns throughout the muscular system of the body allows for bones to move in concert, which allows for organized movement.