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Into the Sense of Hearing

Science Project 7th grade - Spring 2013

Rajvir Dua

on 23 May 2013

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Transcript of Into the Sense of Hearing

of Hearing Into the Sense What is Hearing? Hearing is the ability to perceive sound by detecting vibrations through an organ such as your ear. Hearing is the sense that allows you to experience sound energy by converting sound waves into sound that your brain can interpret. Ears are special organs designed for hearing. The three main components of the ear are the outer ear, the middle ear, and the inner ear. Outer Ear The outer ear contains the the pinna and the external auditory canal, The pinna is the visible part of the ear. Sound travels through the ear canal into the middle ear. Middle Ear The middle ear includes the eardrum, and three bones called the hammer, anvil, and stirrup. The eardrum is a thin membrane that separates the outer ear from the middle ear. The hammer, anvil, and stirrup are small ear bones. Inner Ear The inner ear includes the cochlea and the auditory nerve. The cochlea is a coiled tube and a fluid-filled organ in the inner ear. How you Hear Sound waves that reach the outer ear are transferred through the outer ear into the middle ear. The sound waves make the eardrum in the middle ear vibrate. The vibrating eardrum makes three small bones in the middle ear vibrate. One of these bones, the stirrup, vibrates against the cochlea. The reaction by the neurons in the cochlea creates electric impulses that travel along the auditory nerve to the area of the brain where sound is interpreted. Sound is produced when something vibrates. The vibrations push on nearby air particles. These air particles push on other air particles. These vibrations create many waves of sound energy. Sound travels in waves!!!!!! Sound Ears Problems/Disorders There are many problems that can happen to your ear. They include outer ear disorders, middle ear disorders, and hearing loss. Outer Ear Disorders The ear canal naturally discharges ear wax in order to keep the ear clean. This wax should normally flow out on its own, but if an excessive amount builds up it can affect hearing and cause a sensation that the ear is blocked, which causes irritation. This excessive wax build-up can be caused by the wax not flowing out on its own or from some detergents found in shampoos. Using cotton-buds to get the wax out of your ear is not recommended because it can actually push the wax further into your ear and damage the delicate ear canal. The best way to cure this problem is to put a few drops of warm olive oil every night which melts the wax. Interesting Facts The external ear, the visible part of the ear directs gathers and directs sound waves into your ear canal. A human's external ear is fixed in place, but a lot of animals can adjust, or change, the position of their external ears. This helps them listen to faint sounds. The ability of adjusting the position of your external ears also help some animals, such as rabbits, determine from which direction a sound is coming from. The External Ear Middle Ear Disorders The middle ear is filled with air that comes in from the Eustachian tube. When people catch a cold, mucus builds up in the middle ear. The mucus prevents air from getting in and can be infected by viruses and bacteria when it thickens. Sometimes, the pressure that the mucus exerts on the ear-drum and can cause the ear-drum to burst. When this happens, mucus drains out of the ear. Hearing Loss People's hearing naturally become weak as the body ages. This typically happens somewhere after the age of 50, but can happen earlier if a person is seriously exposed to loud noises. Hearing loss before the age of 50 can also occur as a result from some disease or from ear injury. Semi-Circular Canals Did you know that hearing is not the only thing your ears do? They also help you maintain your balance. Semi-circular canals are special fluid-filled canals in your inner ear and they're filled with hair cells. These hair cells in your semi-circular canals help your brain determine the position of your head by responding to changes in the position of your head with respect to gravity. The End! By: Rajvir Dua
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