Question

how can we hear?????

Answer 1

Answer:

Sound waves enter the outer ear and travel through a narrow passageway called the ear canal, which leads to the eardrum.

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.

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.

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.

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.

The auditory nerve carries this electrical signal to the brain, which turns it into a sound that we recognize and understand.

Answer 2

Here are 6 basic steps to how we hear:

• Sound transfers into the ear canal and causes the eardrum to move
• Sound transfers into the ear canal and causes the eardrum to moveThe eardrum will vibrate with vibrates with the different sounds
• Sound transfers into the ear canal and causes the eardrum to moveThe eardrum will vibrate with vibrates with the different soundsThese sound vibrations make their way through the ossicles to the cochlea
• Sound transfers into the ear canal and causes the eardrum to moveThe eardrum will vibrate with vibrates with the different soundsThese sound vibrations make their way through the ossicles to the cochleaSound vibrations make the fluid in the cochlea travel like ocean waves
• Sound transfers into the ear canal and causes the eardrum to moveThe eardrum will vibrate with vibrates with the different soundsThese sound vibrations make their way through the ossicles to the cochleaSound vibrations make the fluid in the cochlea travel like ocean wavesMovement of fluid in turn makes the hair cells The auditory nerve picks up any neural signals created by the hair cells. Hair cells at one end of the cochlea transfer low pitch sound information and hair cells at the opposite end transfer high pitch sound information.
• Sound transfers into the ear canal and causes the eardrum to moveThe eardrum will vibrate with vibrates with the different soundsThese sound vibrations make their way through the ossicles to the cochleaSound vibrations make the fluid in the cochlea travel like ocean wavesMovement of fluid in turn makes the hair cells The auditory nerve picks up any neural signals created by the hair cells. Hair cells at one end of the cochlea transfer low pitch sound information and hair cells at the opposite end transfer high pitch sound information.The auditory nerve moves signals to the brain where they are then translated into recognizable and meaningful sounds. It is the brain that “hears”.