Sound How You Hear Sound What is Sound

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Sound How You Hear Sound

Sound How You Hear Sound

What is Sound? • Sound is Longitudinal waves that travel through a medium &

What is Sound? • Sound is Longitudinal waves that travel through a medium & can be heard when they reach a person’s or animal’s ear – Also called sound waves • Remember: – Decibels measures amplitude (volume/loudness of sound) – Hertz measures frequency (pitch of sound)

How Does It Work? ? ? • You are sound asleep. Suddenly, your alarm

How Does It Work? ? ? • You are sound asleep. Suddenly, your alarm goes off and you jump awake. • How does your brain receive this information?

Function • The ears gather sound waves & send information about sound to your

Function • The ears gather sound waves & send information about sound to your brain • Three main sections all with different functions – Outer Ear – Middle Ear – Inner Ear

Outer Ear • The part of the ear you see • It acts like

Outer Ear • The part of the ear you see • It acts like a funnel, collecting sound waves & directing them into the narrow region called ear canal • Only a few cm long and ends at the eardrum • Eardrum – small, tightly stretched, drum-like membrane • Sound waves make the eardrum vibrate

Middle Ear • Located behind the eardrum • HAS 3 smallest bones in the

Middle Ear • Located behind the eardrum • HAS 3 smallest bones in the body – Hammer, Anvil, Stirrup • The hammer is attached to the eardrum • When the eardrum vibrates, hammer does too • Transmits vibrations first to anvil then stirrup

Inner Ear • There is a membrane that separates the middle ear from inner

Inner Ear • There is a membrane that separates the middle ear from inner ear • When the stirrup vibrates against the membrane, vibrations pass into the cochlea • cochlea is a fluid filled cavity shaped like a snail shell • Contains more than 10, 000 tiny hair cells

Inner Ear Cont. – Hair like projections float in a fluid in the cochlea

Inner Ear Cont. – Hair like projections float in a fluid in the cochlea – When vibrations move through the fluid, hair cells move, causing messages to be sent to the brain through the auditory nerve • The brain then processes messages and tells you what you heard

- How You Hear Sound

- How You Hear Sound

Hearing Loss • If hearing is damaged, it may cause a difficult time hearing

Hearing Loss • If hearing is damaged, it may cause a difficult time hearing soft sounds or high-pitched sounds • Can be caused by – Injury – Infection – Exposure to loud sounds – Aging

Causes of Hearing Loss • Can occur if the eardrum is damaged or punctured

Causes of Hearing Loss • Can occur if the eardrum is damaged or punctured • Infections can damage the inner ear • Excessive loud music can damage hair cells so signals can no longer be sent to the brain • With age, some hair cells die in the cochlea and are never replaced

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