Sound Notes 4 - Hearing

Hearing

• To hear, you need 3 things:• Source of Sound• Medium to transmit sound• Sense organ to detect the sound

Ear• Sense organ that detects sound

• 3 Main Parts of the Ear• Outer Ear• Middle Ear• Inner Ear

Hearing: How it Works• 1) Sound ______________ enters the outer ear.

• 2) Outer ear funnels the sound wave into the ______ ________ to the ____________.

• 3) Eardrum _______________ due to vibrating ________________ in the sound wave.

• 4) Vibrations are transferred to the __________ ear. The middle ear has 3 small bones;

the ____________, __________ & ____________.

• 5) Vibrations transferred from hammer to __________, then to the ______________.

waves

earcanal eardrum

vibratesair particles

middle

hammer anvil stirrup

stirrupanvil

Hearing Continued• 6) Vibrations transmitted to ___________ ear then

transferred to ______________.

• 7) Cochlea is filled with _____________ and is attached to __________ __________.

• 8) Nerve fibers join to form one nerve that goes to the ____________.

• 9) Vibrations from the cochlea become __________________ _______________ in

the nerve. The nerve transmits the impulses to the __________. The brain

interprets the electrical impulses as _____________.

innercochlea

liquidnerve fibers

brain

electrical impulses

brainSOUND