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The Ear

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Pearl Lee

on 25 January 2013

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Transcript of The Ear

By Table #4 The Ear How Are You Able To Hear? How Do You Keep Your Balance? In the inner ear, there are three small loops filled with liquid, and has microscopic hairs. It is called semicircular canals. When you do a movement like tilting your head, the liquid in the semicircular canals move too. The liquid moves the tiny hairs, sending a nerve message to your brain about the position of your head. In less than a second, the brain sends messages to your muscles so that you remain balanced. On each side of the head, there are ears shaped to catch sound waves. The ear then directs the sound waves through your ear canal to your eardrum. Sound vibrates, so when it reaches your eardrum, it vibrates the three tiny bones (ossicles) that serve to amplify sound waves. The energy of the sound reaches the cochlea (or the small curled tube) which is filled with fluid. The sound vibrations causes the fluids to move. The motion of the fluid causes hair-like nerve endings in the cochlea to send messages through the auditory nerve to your brain. Your brain then interprets the messages as the sounds you hear. Inner Picture of the Ear Decibels A decibel is the measure of sound. A person can use a decibel chart to tell them how many decibels are in a particular sound. High volume of various sources can affect and damage our hearing. For example, if you listen to a loud rock concert (about 115 decibels)for a very long time, it may result in hearing loss. If you listen to a sound that has about 125 decibels or more, pain in the ear begins. Decibel Chart Ear Infections Kids from the the age of 2-4 years can develop ear infections for several reasons. They may have shorter or more horizontal Eustachian tubes than adults, which allows bacteria and viruses to find their way into the middle ear more easily. Also, ear infections occur more commonly in boys than in girls, kids who have families with a history of ear infections, and during the winter season when colds are frequent. Common ear infections include the swimmer's ear. Swimmers Ear Swimmer's ear (external otitus) is a common ear disease that infects the ear canal. (or the passage that carries sound to the eardrum.) This infection can occur when you swim for long periods in dirty lakes, rivers, or ponds. Symptoms include severe ear pain, itching, hearing loss, and mild fever. For treatment, doctors may clean the ear canal with a special probe (which is a slender instument designed to investigate an unknown region) or a suction device. Why Do Your Ears Pop? Have your ears ever popped when you were riding a plane, going through a tunnel, or driving up hills? The reason that your ears pop is due to the changing altitude that affects the pressure of the air in your ears. Your middle ear is connected to the back of your nose by a narrow tube called the Eustachian tube. The Eustachian tube acts like a pressure valve and opens to make sure the air pressure is the same on both sides of your eardrum. When it opens, you feel a pop! achoo! How Does the Ear Work? Probe Pearl,Takumi,Liberty,Kai ss s sound waves High Altitudes Sound Waves Sound Waves Balance
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