2. HOW DO WE HEAR? Sound waves enter the ear… Amplified by an oval-shaped membrane called the ______________

3. WHAT HAPPENS IF…

4. HOW DO WE HEAR? Sound then vibrates along 3 bones: 1) ___________ 2) ___________ 3) ___________

5. THEN… Sound then passes along receptor cells in tiny hair-like structures known as __________

6. HOW WE HEAR…IN PICTURES!

7. HEARING & HEARING LOSS

8. Our hearing is measured in ____________ 30 dB a whisper 60 dB normal conversation 70 dB rush-hour traffic 85 dB RISK LEVEL - (Prolonged exposure louder than this will result in hearing loss) 90 dB subway train; lawn mower 100 dB power saw; drill 115 dB loud rock concert 140 dB jet engine 170 dB shotgun blast

9. 1) ______________: The intensity of a pressure wave (decibels) 2) PITCH : The frequency of a pressure wave 3) ______________: Helps differentiate between the same note played on different instruments

10. TIME FOR…

12. THE TONGUE The tongue has tiny bumps covering its surface known as __________ Papillae contain hundreds of receptor cells known as _____________

13. DID YOU KNOW? Some people have EXTRA taste buds, which make them more sensitive to tastes

14. 4 Tastes of the Tongue 1) _____________: Necessary for survival 2) _____________ 3) _____________: Identifies rancid/poisonous food 4) _____________: Identifies healthy foods, rich in calories

15. TIME FOR…