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Effect of Sound Waves on Cochlear Structures (Quiz 2)

What determines the range of sound frequencies a person can hear? Sound travels through the air and through water as waves of changing pressure. The volume of a sound is determined by the amplitude of the sound waves, taller waves are louder sounds than shorter waves. The frequency of sound is determined by the wavelength of the sound waves. Short waves are high-pitched sounds, long waves are low-pitched sounds. The cochlea varies in structure so that different wavelengths stimulate different areas in the basilar membrane. Some wavelengths do not stimulate any area of the basilar membrane and are not detectable. In general, smaller ear structures are able to detect higher pitched sounds. Human children are able to hear higher pitched sounds that adults cannot detect. Both cats and dogs are able to hear higher frequency sounds than humans.

View the animation below, then complete the quiz to test your knowledge of the concept.






1Sound vibrations reach the cochlea via...
A)the footplate of the stapes in the oval window.
B)the footplate of the stapes in the round window.
C)the tympanic membrane.
D)the three bones of the middle ear.
E)the basilar membrane.



2Short wavelengths from high pitched sounds cause displacement of the basilar membrane...
A)near the oval window.
B)far from the oval window.
C)near the round window.
D)far from the round window.
E)near the tympanic membrane.



3Long wavelengths from low pitched sounds cause displacement of the basilar membrane...
A)near the oval window.
B)far from the oval window.
C)near the round window.
D)far from the round window.
E)near the tympanic membrane.



4The function of the round window is to dampen sounds after they stimulate the hair cells.
A)True
B)False



5The first ear structure that sound waves cause to vibrate is the tympanic membrane.
A)True
B)False







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