main pont: explain the smallest skeletal muscles in the human body
1. what is the noise-reduction system:
● why? noisy word->noice-reduction system
● basic information: two muscles attached to the ossicles(tiny bones connect the eardrum and cochlea)
● principle: muscles contract->dampen the vibrations of the ossicles->reduce the signal (reached in the inner ear)
2+3: how to work?
● contract afterloud external sounds
=reflexively about 1/10 a second -> diagnose hearing disorders& neuro logical conditions
● contract before a person vocalizes
-> protect inner ear from injury, ex:shouting wailing babies
4. birds' hearing system
● similar constructure
● but lies mainly outside the middle-ear cavity->studied more readily