How do the ears hear sounds? How does the human ear hear sounds?

The human ear is made up of three parts: the outer ear, the middle ear, and the inner ear. The human ear has the function of producing the sense of hearing and balance. The normal human ear can distinguish about 400,000 different sounds, some of which are so small that they can only move the eardrum to one-tenth the diameter of a hydrogen molecule.

When a sound is emitted, the surrounding air molecules start a series of vibrations, which are called sound waves, which propagate outward from the sound source. When sound reaches the outer ear, it is transmitted to the ear canal and to the eardrum through the concentrating action of the pinna. The eardrum is the dividing line between the outer and middle ears and is as thin as paper, but very strong.

When sound waves hit the eardrum, it causes the eardrum to vibrate. Behind the eardrum in the middle ear cavity, three interconnected ossicles are immediately followed. Each ossicle is the size of a grain of rice and is the smallest bone in the human body.

Their name is derived from their shape. Next to the tympanic membrane is the mallet (like an iron mallet), followed by the anvil (like an anvil), and finally the stapes (like a stirrup). When the sound waves vibrate the eardrum, the ossicles vibrate as well.

The 3 ossicles actually form a lever system that amplifies sound and transmits it into the inner ear. The last of the three ossicles is connected to a tiny membrane called the oval window. The oval window is the gateway to the inner ear, which contains the cochlea, the organ that specializes in hearing.

When the stapes vibrate, the oval window vibrates with it. On the other side of the oval window are cochlear ducts filled with fluid. When the oval window is vibrate, the liquid also starts to flow.

The cochlea is home to thousands of hair cells, which are topped with tiny cilia. As the fluid flows, the cilia of these cells are impacted, and after a series of bioelectric changes, the hair cells convert sound signals into bioelectric signals that are transmitted to the brain through the auditory nerve. <>

Sound is an invisible sound wave formed by different air pressures of high and low levels, which can be perceived by the human ear. It seems like a simple ear, but it is actually a big family. Exposed, what we usually call the ear is called the pinna, and it is an open door.

Sound waves enter the ear canal from the pinna and vibrate the eardrum. The eardrum is a small, tight skin that sound waves cause it to vibrate. The eardrum is connected to a small bone called the malleus, and the vibration waves are transmitted from the malleus to two other small bones, the incus and the stapes, and then to the cochlea.

The cochlea is a snail-shell-like tube filled with fluid. As a result, the fluid of the cochlea fluctuates and pushes the cilia that protrude from the rows of hair cells in the fluid, which are normally only visible under a microscope. Ciliary movement generates nerve signals that are transmitted to the brain through a structure similar to a thread – nerves in the human body.

In this way, we heard. <>

First of all, let's talk about how sound travels. When sound is emitted, the surrounding air produces a series of vibrations, which are called sound waves, through which the sound travels outward. The next thing to talk about is the inner workings of the radio.

The "radio system" of the "radio" is divided into three parts: the outer ear, the middle ear, and the inner ear. The outer ear is like an antenna for a radio, collecting the various sound waves that travel through the air.

When sound waves come from the external auditory canal, a series of air vibrations will impact the eardrum in the middle ear, causing the eardrum to vibrate, and the vibration of the eardrum is quite weak, perhaps only a billionth of a centimeter of displacement, but enough to smoothly transmit to the ossicles behind it. The wonder of the ossicles is that it can amplify the vibration of the eardrum dozens of times, and transmit the amplified vibration to the inner ear without compromise. <>

The human ear is an important part of the auditory system, and it is the main organ for humans to hear sound. Here's the general process by which a human ear hears a sound:

1.Sound in the ear: When sound travels through the air to the human ear, it vibrates the pinna, causing fluctuations in the air inside the cochlea.

2.Vibration conduction: The vibrations travel through the bones and cartilage in the cochlea to the middle ear.

3.Vibrations are transmitted to the inner ear: When vibrations are transmitted to the inner ear, they trigger a series of physiological responses, such as impinging on the vestibular membrane and ossicular bones.

4.Bioelectric signaling: The inner ear's responses are converted into bioelectric signals, which are transmitted to the brain as nerve fibers conduct.

5.The brain recognizes sounds: When the brain receives these bioelectrical signals, it recognizes the sounds and converts them into the sounds we hear.

In short, the function of the human ear is accomplished by a series of complex physiological processes that allow us to hear the sounds around us.

The process of hearing sound in the ear is to first collect sound from the pinna, which is a physical sound wave, which is collected through the pinna and conducts vibrations through the ear canal to vibrate the tympanic membrane. Behind the eardrum are 3 ossicles, the smallest 3 bones in the human body, and this process is the conduction process. Auricular collection is transmitted through the external auditory canal to the tympanic membrane, which can be amplified by the tympanic membrane and ossicles.

Through sound wave vibration, mechanical energy is transmitted through the tympanic membrane and ossicles to the cochlear window of the stapes floor plate, and the fluid in the inner ear fills the cavity and drives the fluid activity of the inner ear when the stapes move. There are many hair cells in the inner ear structure, and as the fluid fluctuates, the hair cells will swing, and then the mechanical energy will be converted into bioelectricity, which will be transmitted to the center through the cochlear nerve, and the center will give feedback, which is the process of sound conduction.