The Respiratory system

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1. lungs
   1. are controlled by diaphragm and intercoastal muscles
2. nose (air is filtered)
   1. goes to the
      1. pharynx then larynx (voice box)
         1. then enters
            1. the trachea
               1. is protected from food|liquid by
                  1. Epiglottis
               2. then
                  1. bronchi (two tubes)
                     1. then
                        1. bronchioles (smaller tubes)
                           1. then
                              1. Alveoli of lung (capillary rich elastic sacs)
                                 1. where
                                    1. o2 diffuses in
                                    2. co2 diffuses out