Hearing

THE EARS CONVERT THE SOUND ENERGY INTO A NEUTRAL SIGNAL WHICH IS LATER RECEIVED BY THE BRAIN.

THERE ARE THREE PARTS OF THE EAR:

– THE OUTER EAR

– THE MIDDLES EAR

– INNER EAR

THE PROCESS

IT ALL STARTS WITH HTE SOUND WAVES FALLING ON THE OUTER PART OF THE EAR,

THE PINNA 

THE PINNA ACTS LIKE A FUNNEL

EARDRUM

IT IS A DELICATE PIECE OF STRETCHED SKIN.

THE SOUND-WAVE MAKES IT VIBRATE LIKE A DRUM.

WHEN THE EARDRUM VIBRATES, IT SHAKES A CHAIN OF THREE BONES.

COCHLEA

IT IS A SMALL CIRCULAR TUBE FILLES WITH LIQUID.

IT CONSISTS OF MANY HAIR.

THE COCHLEA CONVERTS THE SOUND VIBRATION INTO LIQUID VIBRATION THAT MOVE THE TINY HAIR.

THIS CREATES NERVE SIGNALS THAT GET SENT INTO THE AUDITORY NERVE AND THE BRAIN PROCESSES THESE SIGNALS AS SOUNDS.

TRIVIA

• “COCHLEA” MEANS SNAIL IN LATIN.
• SOME ANIMALS HEAR WITH DIFFERENT BODY PARTS:
  • • • SNAKES USE JAW BONES
      • FISH RESPOND TO PRESSURE CHANGES
      • MALE MOSQUITOES USE ANTENNAE