20.2. Hearing Sound http://www.ck12.org
FIGURE 20.8
This highly magnified image of a hair cell shows the tiny hair-like structures
on its surface. What function do the "hairs" play in hearing?MEDIA
Click image to the left for use the URL below.
URL: http://www.ck12.org/flx/render/embeddedobject/5045Most adults experience at least some hearing loss as they get older. The most common cause is exposure to loud
sounds, which damage hair cells. The louder a sound is, the less exposure is needed for damage to occur. Even a
single brief exposure to a sound louder than 115 decibels can cause hearing loss.Figure20.9 shows the relationship
between loudness, exposure time, and hearing loss.
FIGURE 20.9
The louder the sounds are, the less time
you should be exposed to them for the
sake of your hearing.