skeletal system

• function of skeletal system

  1. support body
  2. protect vital organs
  3. help body move
  4. make blood cells in bone marrow
• protection bones

  1. skull protects brain
  2. vertebrae protect spinal cord
  3. ribs protect heart , lungs and liver
• muscles attach to bones via tendons.

  Skeletal muscles contract and relax to move bones
• antagonistic muscles

  a pair of muscles that act on a joint. As one contracts the other relaxes allowing the joints to move. Eg, biceps and triceps in the arm
• cartilage

  A tough, flexible material found in the nose and ears, but also between bones in your spine, knees and around your trachea. It’s found between joints to stop bones wearing away
• ligament

  strong cord-like tissues which attach to the ends of bones either side of the joint. They hold the bones in the correct place.
• tendons

  strong cord-like tissues that attach the bones in the joint to muscles which contract and relax to move them.
• pivot joint

  bones that can rotate around eachother eg, lower arm and neck
• hinge joint

  bones that act like hinges on a door , allows movement in only two directions eg, elbow and knee
• ball and socket joint

  bones that connect like a ball and a socket allowing for the greatest amount of movement. Eg, hip and shoulder