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HUMAN BODY -EARS




ANY   SOUND,  ,playing  a  drum,bird song, noise   of  a  jet  plane-is  simply  a  vibration    which  travel   along  the  air   waves.These   sound  vibrations    reach   an  eardrum.The   eardrum  is  attached  to  a   bone-called    hammer  .This   hammer  passes   the  sound  onto  two  more    bone    called  anvil  and  stirrup.These   two  bones  have  got  their  name    because  of  their   shapes.These   two  bones  transmit   the   sound    vibration  to  an  inner  ear   where  these  sounds   are  converted   into   electrical    signals   that   our    brain  can  interpret.We   can  differentiate   between  high  and  low   volume  and  pitch.
Our  ear   not  only   allow  us  to   hear   ,but    they  also  help  us   to  keep  our  balance.We   can  also     detect  the  direction of   the  sound .The  one  of the  outer  parts  of  the  ear  called  Pinna,  is  used   to    find  out   the  direction   of  the  sound.
The  smallest   bone   is   the  "stirrup",deep  in  the  ear.It  is  hardly  larger   than  grain  of  rice.
The    ear  and  nose   do not  have    bones    inside   them.Their   inner   supports  are   cartilage  or "gristle",which  is lighter  and  more flexible   than  bone.This  is  why  nose   and   ear  can   be bent 
After  death  ,cartilage rot   faster  than  bone.This  is  why    the  skulls  of  skeletons   have  no  ears  and  nose.












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