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Authoritative PPT Summary
"How We Hear Sounds" Sound PPT
Part One: Structure and Function of the Ear
Observe the structure diagram of the ear. Think about what are the main functions of the outer ear, middle ear, and inner ear? Share your ideas within the group.
Sound→ear canal→tympanic membrane→ossicles→cochlea→auditory nerve→brain
PPT on how we hear sound, Part 2: Observe and compare the vibration of the "tympanic membrane"
There is an eardrum in our ear, which receives various sounds and vibrates all the time.
Use a balloon skin, cup and rubber band to make a "tympanic membrane model" to feel the vibration of the eardrum.
Place a small amount of fine sand or shredded paper on top of the "tympanum". A tuning fork is used to create sounds of different intensity and distance above the "tympanic membrane".
Observe and compare how the "tympanic membrane" vibrates when the tuning fork makes stronger and weaker sounds.
Observe and compare the relationship between the vibration of the eardrum and the distance from which it receives sound.
PPT on how we hear sound, Part 3: The role of the auricle
How would the sound we hear change if we put our hands behind our ears and face the direction the sound is coming from?
animal ears
Bat’s ears are used to receive sonar echoes.
The ears of cats, dogs, and rabbits are erect, and they can hear as long as there is a little sound.
Elephant ears also dissipate heat.
How do we hear sounds PPT, Part 4: How do we hear sounds
Let’s talk about the functions of each part of the ear.
Auricle: collects sound waves
Ear canal: carries sound waves to the middle ear
Tympanic membrane: converts sound waves into vibrations
Ossicles: transmit vibrations to the inner ear
Cochlea: converts vibrations into auditory signals
Auditory nerve: carries auditory signals to the brain
How do we hear sounds?
A vibrating object causes the air around it to vibrate. The vibrating air reaches our ears, causing the eardrums to vibrate. The ossicles in the ear then transmit vibrations to the inner ear filled with fluid, causing the fluid to vibrate. The vibration of the fluid stimulates the auditory nerve - generating a signal. The brain receives the signal from the auditory nerve, and we feel the sound.
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