Which is the correct order of events of sound transmission through the ear 1 sound waves strike the eardrum?

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Which is the correct order of events of sound transmission through the ear?
1. sound waves strike the eardrum
2. the ear ossicles vibrate
3. hair cells of the organ of Corti vibrate
4. the perilymph in the cochlea moves
5. sound waves enter the external auditory canal
A. 5, 4, 3, 2, 1
B. 1, 2, 3, 4, 5
C. 5, 1, 2, 4, 3
D. 5, 2, 1, 3, 4

Select the sequence of events for the olfactory pathway

1. a second messenger opens cation channels (Na+ and Ca+2)
2. depolarization of olfactory receptor cells occurs
3. odorant binds to olfactory receptor protein
4. G protein activates cyclic adenosine monophosphate
A. 1, 2, 3, 4
B. 4, 2, 1, 3
C. 3, 4, 1, 2
D. 2, 1, 4, 3
E. 3, 1, 2, 4

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Hearing depends on a series of complex steps that change sound waves in the air into electrical signals. Our auditory nerve then carries these signals to the brain. Also available: Journey of Sound to the Brain, an animated video.

  1. Sound waves enter the outer ear and travel through a narrow passageway called the ear canal, which leads to the eardrum.
  2. The eardrum vibrates from the incoming sound waves and sends these vibrations to three tiny bones in the middle ear. These bones are called the malleus, incus, and stapes.
  3. The bones in the middle ear amplify, or increase, the sound vibrations and send them to the cochlea, a snail-shaped structure filled with fluid, in the inner ear. An elastic partition runs from the beginning to the end of the cochlea, splitting it into an upper and lower part. This partition is called the basilar membrane because it serves as the base, or ground floor, on which key hearing structures sit.
  4. Once the vibrations cause the fluid inside the cochlea to ripple, a traveling wave forms along the basilar membrane. Hair cells—sensory cells sitting on top of the basilar membrane—ride the wave. Hair cells near the wide end of the snail-shaped cochlea detect higher-pitched sounds, such as an infant crying. Those closer to the center detect lower-pitched sounds, such as a large dog barking.
  5. As the hair cells move up and down, microscopic hair-like projections (known as stereocilia) that perch on top of the hair cells bump against an overlying structure and bend. Bending causes pore-like channels, which are at the tips of the stereocilia, to open up. When that happens, chemicals rush into the cells, creating an electrical signal.
  6. The auditory nerve carries this electrical signal to the brain, which turns it into a sound that we recognize and understand.

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Vision, Hearing and Speech Aging and Hearing

Understanding the parts of the ear — and the role of each in processing sounds — can help you better understand hearing loss.

The Outer Ear

The auricle (pinna) is the visible portion of the outer ear. It collects sound waves and channels them into the ear canal (external auditory meatus), where the sound is amplified.

The sound waves then travel toward a flexible, oval membrane at the end of the ear canal called the eardrum, or tympanic membrane. Sound waves cause the eardrum to vibrate.

The Middle Ear

The vibrations from the eardrum set the ossicles into motion. The ossicles are actually tiny bones — the smallest in the human body. The three bones are named after their shapes: the malleus (hammer), incus (anvil) and stapes (stirrup). The ossicles further amplify the sound.

The tiny stapes bone attaches to the oval window that connects the middle ear to the inner ear. The Eustachian tube, which opens into the middle ear, is responsible for equalizing the pressure between the air outside the ear and that within the middle ear.

The Inner Ear

The sound waves enter the inner ear and then into the cochlea, a snail-shaped organ. The cochlea is filled with a fluid that moves in response to the vibrations from the oval window. As the fluid moves, 25,000 nerve endings are set into motion. These nerve endings transform the vibrations into electrical impulses that then travel along the eighth cranial nerve (auditory nerve) to the brain.

The brain then interprets these signals, and this is how we hear.

The inner ear also contains the vestibular organ that is responsible for balance.

Research Shows A Closer Look at the Cochlea

A small portion of a rodent’s cochlea is captured in this image. In green are four rows of hair cells that respond to sound vibrations, and in red are auditory nerve fibers that convey sound information from the hair cells to the brain. Researchers at Johns Hopkins are studying the molecular mechanisms that guide the formation of hair cells. Studies such as these might be a step towards less invasive treatments for deafness in which molecular cues can be used to biologically regenerate hair cells in the cochlea.

What are the 4 steps of hearing?

How humans hear.
Step 1: Sound waves enter the ear. When a sound occurs, it enters the outer ear, also referred to as the pinna or auricle. ... .
Step 2: Sound moves through the middle ear. Behind the eardrum is the middle ear. ... .
Step 3: Sound moves through the inner ear (the cochlea) ... .
Step 4: Your brain interprets the signal..

What is the correct order of events in sound perception?

Here are 6 basic steps to how we hear: Sound transfers into the ear canal and causes the eardrum to move. The eardrum will vibrate with vibrates with the different sounds. These sound vibrations make their way through the ossicles to the cochlea. Sound vibrations make the fluid in the cochlea travel like ocean waves.

What is the correct order of sound transmission in the ear?

The eardrum vibrates. The vibrations are then passed to 3 tiny bones in the middle ear called the ossicles. The ossicles amplify the sound. They send the sound waves to the inner ear and into the fluid-filled hearing organ (cochlea).

What is the correct order in which sound waves are transmitted through the ear I tympanic membrane II ossicles III external auditory canal IV cochlea?

So, the correct answer is 'Ear drum - auditory ossicles - fluid of cochlea - basilar membrane - hair cells'.