Sound waves pass through the air
it reaches the ear drum(thins sheet of tissue between outer and middle ear–> make it vibrate rapidly)
Tiny bones in middle ear
Form a connection between ear drum and oval window (sheet of tissue–> between middle ear and inner ear)
Transmit vibrations from ear drum to oval window
AMPLIFY the sound by about 20 times
Cochlea (inner ear)
tubular coiled fluid filled structure
sensory cells are attached to membranes
cells have hairs stretching from one membrane to another
because of hair cells- we can distinguish between sounds of a different pitch
Round window
without rw oval window would not be able to vibrate because fuild in the cochlea would prevent it from moving
round window pushes guild outwards
Posted in: SL2 Biology
Alisa's Blog 
Posted on February 2, 2014
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