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Lecture 2

Lecture 2 Readings - Healthy Hearing

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Health Sciences
Health Sciences 2000A/B
Leichelle Little

LECTURE 2 READINGS: HEALTHY HEARING Noise-Induced Hearing Loss • Exposure to harmful noises – sounds that are too loud or loud sounds that last a long time – damages sensitive structures in our inner ear, causing noise-induced hearing loss (NIHL) • Can be caused by a one-time exposure to an intense impulse sound (such as explosion) or by continuous exposure to loud sounds over an extended period of time (such as noise generated in a woodworking shop) • Sound is measured in units called decibels • Sounds less than 75 decibels are unlikely to cause hearing loss; however, long or repeated exposure to sounds at or above 85 decibels can cause hearing loss • People of all ages, from children to older people, can develop NIHL • Approximately 15% of Americans between the ages of 20 and 69 (26 million Americans) have hearing loss that may have been caused by exposure to loud sounds or noise at work or in leisure activities • Steps of hearing 1. Sound waves enter outer ear and travel through a narrow passageway called the ear canal, which leads to eardrum 2. Eardrum vibrates from incoming sound waves and sends these vibrations to three tiny bones in the middle ear – these bones are called the malleus, incus and stapes 3. Bones in the middle ear couple the sound vibrations from the air to fluid vibrations in the cochlea of the inner ear, which is shaped like a snail and filled with fluid. Elastic partition runs from
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