What color is the skin of a polar bear? Detailed answer

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What color is the skin of a polar bear? Detailed answer

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What color is the skin of a polar bear?

Black. The bear's fur seems white, but it is devoid of pigment, the hairs are hollow. Probably for this reason, it perfectly transmits solar radiation. Dark skin absorbs solar energy, which helps to survive in the cold climate of the Arctic.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

How does the ear work?

The ear is one of the most interesting instruments of our body. It can perceive both the quiet ticking of a clock and deafening explosions.

However, more than one ear gives us such a wonderful opportunity. The process of "hearing" begins with sound. Vibrations in the air, called sound waves, hit the eardrum of our ear. We cannot see or feel these waves, but the ear is so sensitive that the slightest vibration is picked up and transmitted to the brain. Only then do we really hear the sound.

The ear is made up of three main parts: the outer ear, the middle ear, and the inner ear. Some animals can extend their outer ear in order to hear better. But people do just fine without it.

When sound waves enter the outer ear, they continue down the external auditory canal. At its end is thin skin, tightly stretched across. It separates the outer ear from the middle ear and is called the tympanic membrane. On the inside is a short tube called the "Eustachian tube" that leads to the larynx. This provides the same pressure as atmospheric pressure on the eardrum from the side of the middle ear cavity. Otherwise, the membrane could be torn due to the loud sound.

Behind the tympanic membrane in the middle ear are three small auditory ossicles called the hammer, anvil, and stirrup. They connect the tympanic membrane to an elastic membrane that tightens the oval window of the inner ear. Sound waves, reaching the outer ear, move along the ear canal and cause the eardrum to vibrate. The auditory ossicles in turn amplify and transmit vibrations to the oval window of the inner ear. This causes the fluid that fills the concha of the inner ear, or cochlea as it is also called, to vibrate. Its tiny cells perceive sound with special nerves. They transmit the received signal to the brain, where it is processed, and only after that we "hear".

There are also three semicircular canals in the inner ear, which are not related to hearing. They are also filled with fluid and are responsible for the sense of balance. If they are out of order, damaged, we feel dizzy and cannot move normally.

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