HEARING MECHANISM: Hearing is wonderful experience isn't it . we are hearing various frequency of sounds .the sound travels in air and collected by our pinna to guide it to ear drum . the eardrum sets into vibration which are transmitted to inner ear by chains of small bones namely malleus , incus and stapes. This chain is an amplifier of our hearing system as now the sound enters in inner ear fluid which is dense as compare to air. Our inner ear Is filled with fluid called endolymph which is stimulated by stapes movement and thus the wave passed in the inner ear and the point at which the wave fades stimulate the nerve ending at that point and we hear that specific frequency. Our inner ear  is called chochlea . It’s a super computer which process the frequency specifically and the arrangement is such that the various frequencies are transmitted to brain, where the information is processed and various system in brain are connected to find the relevance of the information . Let’s see some examples . when we hear sound of horn we sense danger. So our system recognizes it as danger and act accordingly in fraction of seconds we adopt the position which will protect us. So in our brain that sound has to registered previously as danger sound and its stored in memory ,the action to performed in this scenario  is learnt by us in past and so we act and protects our self.In above example so many systems were involved involuntarily in fraction of seconds . 1)hearing center : to identify that particular frequency 2)memory center: to recollect importance of that sound 3)motar system : muscle stimulation system to perform the action of body parts 4)cerebellum (small brain): for smooth action in complex movement from legs to complete body 5 )symphathetic system : because of which our heart rate increases we sweat. BUT IMMAGINE IF YOU CAN’T HEAR THE HORN No system is stimulated and you may face danger.So we should know why hearing is affected.  

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