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Chapter 16.4 How You Hear Sound Pg. 558- 560. The Human Ear The function of the ear is to gather sound waves and send or transmit, information about sound.

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Presentation on theme: "Chapter 16.4 How You Hear Sound Pg. 558- 560. The Human Ear The function of the ear is to gather sound waves and send or transmit, information about sound."— Presentation transcript:

1 Chapter 16.4 How You Hear Sound Pg

2 The Human Ear The function of the ear is to gather sound waves and send or transmit, information about sound to your brain Your ear has three main sections: 1.The Outer Ear 2.The Middle Ear 3.The Inner Ear Each section has its own unique function

3 The Outer Ear The outer ear looks and functions like a funnel The main function of the outer ear is to funnel sound waves The components of the outer ear are the ear canal and eardrum

4 The Outer Ear The outer ear collects sound waves and directs them into a narrow region called the ear canal – The ear canal is a few centimeters long and ends at the eardrum The eardrum is a small tightly stretched, drumlike membrane – Sound waves make your eardrum vibrate

5 The Middle Ear The middle ear is located behind the eardrum The middle ear contains the three smallest bones in your body – The hammer The hammer is attached to the eardrum and vibrates when the eardrum vibrates The hammer transmits vibrations to the anvil first and the stirrups second – The anvil – The stirrup

6 Inner Ear The inner ear is separated from the middle ear by a membrane – When the stirrup vibrates it vibrates against the membrane and the vibrations pass into the cochlea The Cochlea is a fluid-filled cavity shaped like a snail shell – The cochlea contains more than 10,000 tiny structures called hair cells

7 The Inner Ear The tiny hair cells have hairlike projections that float in the fluid of the cochlea – When vibrations move through the fluid the hair cells move, causing messages to be sent to the brain via the auditory nerve – The brain processes the messages and tells you what you’ve heard

8 Hearing Loss When hearing loss occurs a person may have difficulty hearing soft sounds or high-pitched sounds There are many different causes of hearing loss such as, injury, infection, exposure to loud sounds, and aging

9 Causes of Hearing Loss Injury: Hearing loss can occur when the eardrum is damaged or punctured. – This is why it is dangerous to stick objects in your ears Infection: Can cause damage to the delicate inner ear and cause permanent hearing loss

10 Causes of Hearing Loss Extended exposure to loud sounds can damage hair cells in the ear – The damaged hair cells will no longer be able to send signals to the brain – This type of damage can be prevented! Aging: This is the most common form of hearing loss and it occurs gradually – As people get older their hair cells in the cochlea begin to die ( AND THEY CANNOT BE REPLACED) – People with this kind of hearing loss often have difficulty hearing high-frequency sounds

11 Hearing Aids For certain types of hearing loss, hearing aids can restore some ability to hear – Hearing aids amplify sounds entering the ear, and others can amplify specific frequencies that they person has lost the ability to hear – Hearing aids come in all different sizes

12 Partner Project Ask Your Partner what sound they hear throughout the day – List at least 15 sounds your partner hears – Ask them to rank the sounds they hear ask either painful, quiet, normal, loud – Then ask them to rate each sound as pleasant, neutral, or annoying – Also for each sound record the source, location, time of day, and time exposed to the sound – How are the sound ratings similar? How are they different?

13 SoundSourceLocationTime of day Time of exposure Painful, quiet, normal, loud? Annoying, pleasant, neutral?


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