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HUMAN-BODY-RESPIRATORY SYSTEM-LUNGS

OUR  BODY  HAS  A   BLOOD    TRANSPORT  SYSTEM.It   supplies    the   oxygen    needed  by  the   body cells  and  carries   off their    carbon-Di-oxide  waste.Lungs  work  very  hard  .Every  day  we  take.  about  23,000  breaths.Lungs   are  connected  to  a  wind pipe  called   trachea   .Each  comprises   many  branching   tubes   called    bronchioles.The  air  inhaled    by  us  passes   via  the trachea  into   the  lungs.Blood   in  the  lungs  collects   oxygen  and  takes  it  around  the  body.This  air  is  warmed  to  body  temperature and  saturated  with  water  vapour.When   we  breathe out ,our   lungs   pushed  used  air   out  through   our  nose   or  mouth.Sometimes  ,  we  inhale  foreign particles with  air   that  are  trapped  and  expelled  by   coughing  .The   mechanical   work   required   to ventilate   the  lungs,  is done  by  respratory  muscles.The  Larynx   is  a  part  of  the  respiratory   tract,it  is  the  organ  of   pho-nation.Its    function  is  to   raise    airway  pressure  during  sneezing   and  coughing.
FACTS-
  • At   rest  ,the  body  takes  in and breathe  out    about  10  liters   of air   each  minute.
  • The  right lung  is slightly   larger  than  the  left.
  • Hairs  in  the  nose   help  to  clean  the  air we  breathe,as  well   as  in  warming  it.
  • LUNGS






  • The  highest   recorded   "sneeze  speed"   is  105  km  per   hour.

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