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HUMAN   NOSE  CAN  DISTINGUISH  AROUND  4000  different substances.We   use  our  nose   to  breathe  and   to smell.We  can   differentiate   the  good and  bad  dour.Smell   Smell    floats  in  the  air.We   smell   things  when  take  in  air  through  our  noses.The  sensory  cells  in  the  ,detect  the  smell    and  send  message  to  the  brain  .But  the  exact  details  of  a  smell   mechanism  are  still  uncertain.Our   sense  of  smell   also  helps  our  sense  of  taste.So  our  sense  of  smell  and  taste   are  very closely  linked. Our  tongue   receptors   can  differentiate   only    four  types  of  taste  qualities ;sweet,sour,salt,and  bitter.There  are  thousands  of  taste   buds  all  over  the  tongue .These  survive   only for  a  matter  of   days and  undergo   rapid  and  continuous   replacement.Each  taste  bud  consists  of   sensory  cells  that  are  connected  to  the  mid brain   through  the  taste  fibers.The  sensor   send   messages  to  the    brain  about  what  we  are  eating  .The  front  of   the  tongue   taste  sweet  things .The  side  of  the  tongue   taste  salty  and sour  things .The  back  of  the  tongue  taste   bitter   things .The  tongue   can  also  feel   heat ,cold,and  pain.Many  of  things  that  we  may  think  that  we  are  tasting ,we  are  actually   smelling.















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