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Word Count: 1,110
The ear is the organ of hearing and balance in vertebrates The ear convertssound waves in the air to nerve impulses which are sent to the brain wherethe brain interprets them as sounds instead of vibrations The innermostpart of the ear maintains equilibrium or balance The vestibular apparatuscontains semicircular canals which in turn balance you Any movement by thehead and this apparatus sends a signal to the brain so that your reflexaction is to move your foot to balance you The ear in humans consist three parts The outer themiddle and the inner portions The outer ear or pinna is the structurethat we call the ear It is the skin covered flap of elastic cartilage thatsticks out from the side of the head It acts like a funnel catching soundand sending it to the middle portion of the ear The middle portion containsthe ear drum and the connection between the pharynx and the drum the Eustachiantube The inner ear contains the sensory receptors for hearing which areenclosed in a fluid filled chamber called the cochlea The outer and middleears purposes are only to receive and amplify sound Those parts ofd theear are only present in amphibians and mammals but the inner ear is presentin all vertebrates The ear can hear in several different ways They are volumepitch and tone Pitch is related to the frequency of the sound wave Thevolume depends on the amplitude or intensity of the sound wave The greaterthe frequency the higher the pitch Humans can hear about 30 and 20000waves or cycles per second High pitch sounds produce more of a trebly soundwhile low pitch sounds produce a rumbling bass sound When a person loses these abilities to comprehend soundit is referred to as deafness It can be caused by disease toxic drugstrauma or an inherited disorder Those causes can be classified as conductivesensorineural or both A conductive hearing loss results from damage to thoseparts of the ear which
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