These answers have been taken directly from our tests. According to Ms. Barnett, they are the correct answers to the questions. Part 1. 1. Sound discrimination is telling sounds apart. 2. Inside the cochlea sound waves are turned into nerve impulses. 3. If your semicircular canal was damaged you would not be able to balance. 4. Sound travels faster through liquids and solids then through gas because the molecules are closer together in liquids and solids. Part 2. 5. The fleshy part of the ear is the auricle. 6. You hear sounds with your ears. 7. A dog whistle has a high pitch. 8. The auditory canal is a passageway lined with skin, hairs, and wax producing glands that sound travels through. 9. Two properties of sound are pitch and loudness. 10. When the ear drum is hit by sound waves it vibrates like a real drum. 11-13. The three bones in your middle ear are your hammer, anvil, and stirrup. 14. Bats see using echolocation. 15. To get to your inner ear, sound travels through a membrane called the oval window. 16. The part at the end of the outer ear that vibrates when sound hits it is called the ear drum. 17. Sound moves like dominos, knocking molecules into each other. 18. Nerve impulses are carried to the brain through the auditory nerve. Part 3 19. How does sound travel: Sound waves hit molecules which carry them to the next molecule, and the next, and so on. It's like dominos falling down until it gets to your ear. Sounds travel faster in liquids and solids then in gas because the molecules are closer together so the dominos of sound can fall faster. 20. How does sound get to your brain? Sound waves get trapped by the AURICLE and travel down the AUDITORY CANAL to the EAR DRUM. The waves cause the EAR DRUM to VIBRATE which moves the HAMMER into the ANVIL. This causes the ANVIL to vibrate and the vibrations are sent through the STIRRUP through the OVAL WINDOW into the COCHLEA. In the COCHLEA tiny hairs and liquid turn the sound waves into nerve impulses. The nerve impulses are sent to the brain by the AUDITORY NERVE.
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