How Humans Hear Notes
Hearing: D4K
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____Sound waves_________enter your ears and travel down the ear canal.
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The ear canal is about an ___inch_______ long.
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When sound waves hit the ear drum it begins to __vibrate___.
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The ear drum vibrating makes three little bones move to help sound waves move to the inner
ear.
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17,000 tiny _hair____-like tissues bend and stimulate the 30,000 __nerve __ fibers to the brain.
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____2_____ ears are needed to decide a location of a sound.
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Your brain uses the levels of the sounds you hear to decide the ________direction_________
the sound is coming from.
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Continued loud sounds can damage the tiny ____hairs___________ in the cochlea.
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Wear hearing ___protection______________________ is important and turn down the
____volume___________ on your headphones.
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Once hearing is damaged it __cannot_____________ be made all better.
How do you hear sound? reading
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The shape of your ____outer____________
of the ear inside your head.
____ear______ directs sound waves to the part
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Sound travels so fast that you can hear a CD start right away as it travels from the
___speaker_______ to your ear and through your ear to your ___brain__________________.
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Sounds like fire alarms at school and smoke detectors in your home can ______warn_______
you of danger.
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Animals hear sounds through their ___ears________ to their ___brains__________ like
humans.
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Animals can hear ____high____________ ________pitched______ sounds that you can’t hear.
Diagram of the Ear
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The tiny piece of tight skin is called an _____ear drum________________________.
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Sounds enter your ear and make the eardrum move ____back______ and __forth________.
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The _____cochlea_____ is shaped like a snail and is filled with _____liquid_______________.
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The hairs in the cochlea move when ____vibrations_____________ make the liquid move.
Religious Festival Kerala India and All Ears
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Hz stands for ____hertz__________________.
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Ultrasound are sounds ___higher_____than frequencies that humans are able to hear.
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___Infrasound_______________________ are sounds below the frequencies that humans are
able to hear.
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Elephants have infrasonic hearing abilities that allow them to hear sounds at a
_____lower___________ frequency than ______humans______________.
How do humans hear? powerpoint
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There are three main parts of the ear ____outer ear________________, _____middle
ear____________________ and _____inner ear_______________________.
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In the outer ear there are three parts: the pinna (__lobe__________), ear canal, and ear drum.
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In the middle ear there are three ___bones______________: the hammer, anvil and stirrup.
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In the inner ear there is the cochlea and the ____auditory ______
______nerve_____.
Steps to Hearing
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_____Vibrations_______________ move through the outer ear canal and vibrate the eardrum.
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The eardrum passes its energy through a chain of three tiny bones, the anvil, hammer, and
stirrup, in the _________middle____________ of the ear.
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The anvil, hammer, and stirrup pass the energy onto the ____cochlea_____________________.
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The vibrations ____activate_________________ hair cells and fluid inside the cochlea.
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Electrical signals are sent to the ____brain___________________ through the auditory nerve.