You ve got to be kidding Dad. You wouldn t be able to hear anything with ear plugs. Sure I could, his father said. Your mother and I wore them when
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- Dina Murphy
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1 Hearing
2 Hearing The ice show was ending. The music was louder than ever. One last chord echoed across the arena. The audience stood and clapped. Wow, that was really something! Jake said. They really put on a good show! They sure do, his father answered. But I don t know if my ears will ever stop ringing. The music was too loud for me. We should have brought ear plugs. 2
3 You ve got to be kidding Dad. You wouldn t be able to hear anything with ear plugs. Sure I could, his father said. Your mother and I wore them when we went to that rock concert last month. They just made it so that we didn t go home with a headache. My teacher said that loud music can do more than give you a headache, Jake answered. It can damage your hearing. If I want to be a musician I should protect my hearing. I ve always wondered how loud sounds cause hearing loss, Jake s father said. Does it change or break something in the ear? 3
4 You don t know either? asked Jake as they started down the stairs from their seats. I am surprised. We can look it up online when we get home. Not tonight Jake, his father s said. It s pretty late already. Let s check it out tomorrow though. I do want to know how loud sounds can hurt our hearing. The rest of the trip home was filled with talk about the tricks the skaters did and the music. It had been a spectacular show. Jake liked the special lights and sound. The next day Jake and his father were on the computer trying to find out about hearing loss. They learned that the human ear is a complicated system. There are three sections to the ear. Each section has a different function. 4
5 We can see the outer ear on the side of a person s head. It acts like a funnel to bring sound into the ear. It protects the rest of the ear from injury. Ear Flap Outer Ear Middle Ear Anvil Hammer Ear Canal Stirrup Eardrum Inner Ear Auditory Nerve The middle ear starts at the eardrum. Sound energy brought in by the outer ear make the eardrum move. The eardrum changes the sound energy into mechanical energy. This mechanical energy is sent on to the three tiny bones of the middle ear. These bones magnify the movement of the eardrum as they pass the energy to the inner ear. The inner ear is filled with liquid. One part of the inner ear is shaped a little like a snail. It is lined with about 20,000 tiny hairs. The bones of 5
6 the middle ear put pressure on this part of the inner ear. This pressure makes the liquid move. As the liquid moves, it makes some of the tiny hairs move. These send electrical signals to the auditory nerve. The nerve passes the signal on to the brain. The brain understands these signals as sounds. The tiny hairs in the inner ear are what can be hurt by loud noises. They are not very strong. If these hairs are hurt, they will not grow again. You will not be able to hear as well as you did before. Wow! Twenty thousand tiny hairs that can be broken by loud sounds! That is amazing! Jake exclaimed. I would never have guessed that. 6
7 And you can t grow them back after they get injured. His father said. We better protect our hearing. I think I should get ear protection for when I run the lawnmower. This says that any sound louder than normal talking can hurt our hearing if we are hear them too long. Jake looked at his father. Mom was right. Playing my Mp3 player too loud really could hurt my hearing. I need to be careful. 7
8 Sound Unit Hearing Correlation Fountas & Pinnell M DRA 28 Estimated Lexile Measure 640 Written under funding from Monroe 2 Orleans BOCES: June 2007 by: Fred Arnold, Science Resource Teacher Sue Witter, Reading Specialist 10/13 Copyright 2007 by the Board of Cooperative Educational Services for the Second Supervisory District of Monroe and Orleans Counties, Elementary Science Program. All rights reserved. This publication may only be reproduced for one-time classroom use. No part of this publication may be stored in a retrieval system, or transmitted or reproduced, in any form by any means, electronic, mechanical photocopying, recording, or otherwise, without the prior written permission of Monroe 2 Orleans BOCES, Elementary Science Program. Elementary Science Program
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