musculoskeletal system

• The musculoskeletal system is the system that supports the body, protects delicate organs and provides movement to the body. It's made of bones and skeletal muscle.
• the skeleton
• the muscles
• what do muscle fibres contain?

  special proteins that are told when to contract by nerves
• the three types of muscle tissue

  skeletal (voluntary), smooth (involuntary), cardiac
• muscle movement
• if muscles can only pull, how do they work?

  they work in pairs or groups