【测验】Science

Functions:

1.pinna: collects and detects sound into ear canal

2.ear canal: detects sound to the ear drum

3.ear drum: vibrates when sound waves hit it

4.ossicles: amplify vibrations and transfer them to the oval window

5.oval window: transfer vibrations of ossicles to the cochlea

6.cochlea: detects vibrations and converts them to nerve impulses

7.auditory nerve: carries nerve impulses to the brain

8.eustachian tube: equalises air pressure or both side of ear drums, preventing to the damage

9.semicircular canals: detect position and movement of head, to help us keep our balance

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