HOW DO WE HEAR?

Sound waves enter the ear…

Amplified by an oval-shaped membrane

called the ______________

WHAT HAPPENS IF…

HOW DO WE HEAR?

Sound then vibrates along 3 bones:1) ___________

2) ___________

3) ___________

THEN…

Sound then passes along receptor cells in tiny hair-like structures known as __________

HOW WE HEAR…IN PICTURES!

HEARING & HEARING LOSS

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

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

TIME FOR…

THE TONGUE

The tongue has tiny bumps covering its

surface known as __________

Papillae contain hundreds of receptor

cells known as _____________

DID YOU KNOW?

Some people have EXTRA taste buds,

which make them more sensitive to tastes

4 Tastes of the Tongue

1) _____________: Necessary for survival

2) _____________

3) _____________: Identifies rancid/poisonous food

4) _____________: Identifies

healthy foods, rich in calories

TIME FOR…