When you have a good ear, you have something really precious. Thought! You can hear the melodious song of a bird, the whisper of a stream, the voice of a loved one. You can also use your ears to receive vital messages, possibly from a horn, siren, or fire alarm.
Have you thought about your incredible hearing yet? And what do other beings have? Even a brief exam can be exciting.
How can you feel
A glance at the image below shows that your ear is much more than a trumpet-shaped organ near your head. This part is just the ear. It collects sound waves and sends them through the external ear canal. It contains small hairs and glands that produce wax. Your goal To avoid dust, insects, etc. They deepen and cause damage.
When sound waves reach the end of the canal, they reach the eardrum, which is made of thin, compact tissue. The resulting vibrations are amplified by three small bones, the auditory bones, and transmitted to the middle ear. They are often called hammers, anvils, and stirrups because of their shape. The funnel "hits" the membrane in the "oval window" and transmits the vibrations to the fluid-filled inner ear. Sound waves also enter the inner ear through the “round window” below the “oval window”. Some waves reach the skull to the inner ear.
The semicircular canals are located in the central vestibule of the inner ear. The movements of the fluid they contain allow you to maintain physical balance. But hearing is linked to the snail. The sound waves passing through the liquid activate the membrane of the cochlear basil. Its movement, in turn, vibrates the hair cells that make up the organs of Cortis. This movement stimulates the nerves that are connected to the hair cells. Eventually, these nerves send messages to the auditory center of the brain as electrical impulses through the auditory nerve. All of this is known, but how a person can understand these signals continues to confuse scientists.
Word about what you hear
You can't hear all the sounds around you and that's fine. As a child, their hearing range can range from 15 to 30,000 cycles or vibrations per second. Let's say less than 15 cycles have passed. Then he felt his own heartbeat, even the movements of his legs and muscles!
Although there are some limitations, the listening area is impressive. Although people are different, the loudest tone tolerated is usually 2,000,000,000,000,000 times greater than the least noticeable tone! Indeed, the human ear has the greatest practical sensitivity to its needs.
Of course, over the years imperfect people experience progressive hearing loss. One of the reasons for this is that the tissues in the inner ear lose their elasticity. Higher hearing levels are likely to increase from 30,000 cycles in childhood to around 4,000 cycles by the age of 80. But that's enough for normal conversations.
Truly a masterpiece!
Your ears are protected from extremely loud noises. Of course, a sudden explosion nearby can cause strong vibrations that can cause irreparable damage to your complicated hearing aid. However, as a very loud noise gradually builds up, the fast-acting muscles may "turn down the volume." The eardrum is stiffened to reduce its vibrations, and the muscles of the middle ear twist the auditory bones. Therefore, the calipers do not transmit these large vibrations through the "oval window" to the inner ear.
Protection is also provided by the ear canal which runs from the nasal cavity to the middle ear. This passage carries air and matches the pressure in the eardrum to the pressure outside. Here there is protection against the lack of eardrums due to a strong change in pressure in the outside air.
Also think about the noises you hear. Surprisingly, a distinction is made between thunder and the sound of a car, the footsteps of a person and the hooves of horses, although their origin cannot be identified. In addition, both ears can be "tuned" to the sound. You might have flipped a coin and can't see where it rolled. However, you have heard that it falls to the ground and ricochets maybe once or twice. Then you heard him fall and hit a chair. He finally heard the coin fall and ring before it stopped. The two ears help to find the place.
Unsurprisingly, it was said of the human ear: "If an engineer were to duplicate his role, he would need to compress a general address system, which includes an impedance adapter, a long-range mechanical analyzer and a device, to about one cubic centimeter." . . "Mobile relay and amplifier, multi-channel converter for converting mechanical energy into electrical energy, systems for maintaining a sensitive hydraulic balance and two-way internal communication system. Even if you managed to perform this miracle of miniaturization, you probably could not hope to match your ear performance."
Hear the wildlife
You have the right to be impressed by the human ear. But what about the other creatures? Humans can see the outer ears of dogs, cats, horses and monkeys and know that these animals respond to sound. Although birds do not have outer ears, most people know that these creatures can hear. In fact, a bird's hearing range is about the same as a human's. And the snakes? I hear
Some naturalists claim that snakes cannot hear. In fact, recent findings show that these animals have a hearing mechanism and can hear quite well. For example, researchers Peter H. Hartline and Howard W. Campbell found that not only vibrations from the substrate but also noise from the air cause electrical reactions in species of three snake families. About a boa constrictor, they wrote: "If a brain reaction is accepted as an indication of hearing, these snakes can hear the sound of air."
And the insects?
Some researchers concluded that not all insects can hear. But many of these little creatures have remarkable hearing abilities. Some respond to sounds that lie beneath the human ear. Others may see them more than two octaves higher than people may perceive.
Bug hearing aids vary and often occur in unusual places. The eardrum of small hornbills lies on the abdomen. The male attracts a grasshopper by rubbing the edges of its front wings with its backs on its hind legs. It is the woman's "music in the ears" that listens and decides to be her partner.
Katydid and crickets also have "ears". OR? Just below what can be called "knees" on the front legs. Of course, there are only small openings. But all the female Katydid needs to do to capture the male's mating sound is to move her legs in the direction of the conversation!
Miracle of echolocation
Some creatures use their hearing in very unusual ways. They are equipped for echolocation. These animals emit high-frequency sounds and are controlled, listened to and respond to echoes that return quickly when sounds are reflected from objects. For example, bottlenose dolphins use this method to avoid underwater obstacles.
Among the echo locators is a well-known flying mammal: the bat. If you let a bat into a completely dark room, it can fly without hitting walls or other objects. This is because the animals emit high-frequency sound pulses. When sounds hit obstacles, they hear echoes. Sometimes they send out more than 200 pulses per second. By interpreting the messages derived from these echoes, the creature follows a sure path.
The bat also uses its unique control system to locate the insects it feeds on. However, the difference between echoes that are reflected by obstacles and those that return from possible meals is still a mystery to humans. Some bats also hunt prey directly over the obstacle, a leaf.
Another notable factor is that the bat cannot hear the sounds it makes. Each time a person is sent, the muscle contractions of the ears become "silent" so that only the echo is heard. In addition, each bat can own and follow its own sound pattern, as there is no massive confusion when hundreds of these creatures meet.
What a sound and hearing system the creator gave the apple! It has already been said: "Scientists estimate that bat sonar, ounce for ounce and watt for watt, is a billion times more sensitive and efficient than any radar or artificial sonar."
Protect your hearing
Whether you are watching animals or thinking for yourself, you will no doubt realize that your hearing is truly amazing. And you will certainly want to take care of and protect your hearing aid.
Your ears are attacked by a lot of unwanted noises in this modern world. Noise pollution has become a major problem in many places. For example, if you have to work with very tall machinery, it may be advisable to wear earplugs. They can protect you from hearing damage and hearing loss.
If you are a smoker now, another way to protect your hearing is to quit smoking. The nicotine in tobacco causes the arteries in the inner ear to contract. This, in turn, reduces blood flow and, therefore, the flow of nutrients that the inner ear needs to play an important role in your life.
Never test your ears with objects like hairpins or matches. If the skin is broken in this way, infection can occur.
