Quiz-Tree
Question 1
Which part of the brain processes sound?
The auditory cortex, in the temporal lobe, turns nerve signals into the sounds we recognize, such as speech and music.
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Answer question 1 to unlock
The frequency of a sound is measured in ___.
Hertz (Hz) counts vibrations per second. Middle C on a piano is about 262 Hz.
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Answer question 2 to unlock
Inside the cochlea, sound is detected by tiny ___.
The cochlea contains thousands of hair cells. Their hair-like tips bend when the fluid around them moves.
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Answer question 3 to unlock
What does the eardrum do when sound waves reach it?
The eardrum is thin and tight, like the skin of a drum. Sound waves make it vibrate, and the vibrations pass to the ossicles.
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Answer question 4 to unlock
Which nerve carries sound signals from the cochlea to the brain?
The auditory nerve (the cochlear branch of the vestibulocochlear nerve) carries signals from the hair cells to the brainstem and on to the brain.
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Answer question 5 to unlock
The loudness of a sound is measured in ___.
Decibels (dB) measure sound level. Normal conversation is about 60 dB.
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Answer question 6 to unlock
Having two ears mainly helps the brain ___.
The brain compares tiny differences in when a sound reaches each ear and how loud it is. This lets us tell where a sound is coming from and follow a voice in a noisy room.
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Answer question 7 to unlock
A healthy young person can hear frequencies from about ___.
The typical range of human hearing is about 20 Hz to 20,000 Hz. The top of the range drops gradually with age.
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Answer question 8 to unlock
What is the main job of the ossicles?
The ossicles are the three tiny bones of the middle ear: the malleus (hammer), the incus (anvil) and the stapes (stirrup). They are the smallest bones in the body and form a chain linking the eardrum to the inner ear. They pass the eardrum’s vibrations into the fluid of the inner ear.
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Answer question 9 to unlock
Hair cells turn vibrations into ___.
When hair cells bend, they release chemical messengers that trigger electrical signals in the auditory nerve.
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Answer question 10 to unlock
The pitch of a sound depends on its ___.
Pitch is how high or low a sound seems. A higher frequency, meaning more vibrations per second, gives a higher pitch.
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Answer question 11 to unlock
Sound travels through the air as ___.
Sound is made of vibrations that travel as pressure waves through air, water or solids. That’s why it cannot travel through the vacuum of space.
correct answers
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