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					                            LUNGS STRUCTURE AND FUNCTION

Mix’n’match the following columns of information using the diagram below as a reference. I
suggest you colour code to make it easier to revise from. One has been done for you.
NB The notes and function columns are already correctly paired up.




                                                                       7

                       1
                                                                       8
                       2
                                                                       9
                       3

                       4
                                                                       10
                       5
                                                                       11
                       6


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Number Structure           Notes                          Function
  1    Diaphragm           Cartilage flap                 Prevents food from entering trachea
  2    Position of         Contains hairs and             Cleans air as it enters respiratory system
       heart               mucus
  3    Nasal cavity                                       Protection for the lungs

   4      Bronchus         Small air sac; 1 cell          Site of gas exchange; very small
                           thick; squamous                distance and large SA:Vol for efficient
                           epithelial cells; large        gas exchange
                           SA:vol
   5      Epiglottis       C-shaped cartilage;            C-shaped cartilage for flexiblesupport,
                           ciliated epithelial cells      prevents collapse; elastic fibre and
                           and goblet cells; smooth       smooth muscle allow stretch and recoil;
                           muscle; elastic fibres         ciliated epithelial and goblet to reduce
                                                          infection
   6      Mouth cavity     Voice box                      Produce sound as sound waves travel
                                                          over
   7      Mouth            Muscle, very strong            Contracts during deep breathing to
                                                          increase volume of lungs
   8      Rib              In between lungs               Close to respiratory system for efficient
                                                          gas exchange
   9      Larynx                                          Entrance for air into the mouth cavity
  10      Trachea                                         Space between mouth and trachea
  11      Bronchioles      Narrower airway;               Dividing the airway to provide air to all
                           irregular cartilage;           the individual alveoli; cartilage to prevent
                           otherwise similar in           collapse; similar in function to trachea
                           structure to the trachea
  12      Alveoli          Little or no cartilage, wall   Smooth muscle can contract to constrict
                           mostly made of smooth          the airway (if harmful substances in air or
                           muscle & elastic fibre         allergy/asthma)

				
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