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Breathing and skeleton (breathing (Inhaling (muscles in ribs contract…

- - - - they pull rib cage up and out
    - - moves down
    - - forces air in
  - - - moves up
    - - forces air out
  - - - the lungs are two balloons
- - - - The bone marrow produces red and white blood cells
        
        red blood cells take oxygen to the muscles, white fight infection
    - - Pivot joints
      - Ball and sockets joints
      - Hinge joints
      - Fixed joints
      - diagram
  - - - the skeleton supports the body and gives it shape
    - - the bones in some places protect vital organs such as the brain or heart
    - - The bones produce blood cells, which are vital for the body
    - - bones are joined to muscles, and the skeleton helps muscles move