How does a fish breathe? Detailed answer

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How does a fish breathe? Detailed answer

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How does a fish breathe?

Hundreds of thousands of years ago, long before humans appeared on Earth, fish were already swimming in the oceans. At that time they were the most highly developed creatures.

Since then, they have developed in a variety of ways, so that now only a few species only remotely resemble the first primitive ocean fish.

As a rule, the fish has an elongated and tapering shape towards the end. People copied it in the construction of ships and submarines, as it is best suited for movement in the water.

Most fish use their tail as a motor. With the help of a tail and fins, they control their movements. Except for one species of fish, all the rest breathe with the help of gills. The fish swallows water through its mouth, which passes through the gills and pours out through a special hole. Water also contains oxygen, and it enters the blood of fish through the gills, like air through the lungs into the blood of a person.

In polluted water, fish try to float to the surface and breathe in air, but their gills are not adapted to absorb oxygen from the air.

The blood of fish is cold, but their nervous system is the same as that of other animals, they are also sensitive to pain. Their sense of touch is very sharp, and they perceive the taste with all their skin.

Fish can smell. They have two small scent organs located in the nostrils on their heads. Fish have ears, but they are inside the head and are called "inner ears".

The reason fish are dark on top and light below is to help them defend themselves against their enemies who, looking down, see the dark color blend into the water of a river or ocean. Looking from below, it seems that this is a light surface of the water. There are more than 20 thousand fish, and it's hard to imagine how much unique there is in the life of each!

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

How did the rulers of Sparta deal with the soot that smeared their chairs?

Once, several residents of the city of Clazomena, having arrived in Sparta, committed an impudent act - they smeared the chairs of the ephors (members of the highest board of the city) with soot. Upon learning of this, the ephors did not show their indignation, but called the herald and ordered him to announce the order: "Clazomenians are allowed to behave obscenely."

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