Does a fish have a heart? Detailed answer

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Does a fish have a heart? Detailed answer

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Does the fish have a heart?

Sometimes it is very difficult for us to imagine that beings completely different from us can have organs that are very similar to ours and function in much the same way. Many people think that since a fish lives in water and has cold blood, then it must lack various internal organs or any senses. In fact, the internal structure of fish is very similar to the structure of higher, warm-blooded animals.

Many scientists believe that this similarity proves that life on land came from the sea! Fish breathe and digest food. They have a nervous system, they feel pain and physical discomfort. They have a highly developed sense of touch. They have a taste sensation as well as very sensitive skin. They have two small olfactory organs in the nostrils located on the head. They even have ears, but they are inside the body of the fish. Fish have no external organs of hearing. The eyes of fish are the same as those of other vertebrate species, but have a simpler structure.

So you can see that fish have "systems" that allow them to perform functions similar to those of our body. Let's take a quick look at just two of these systems - digestion and circulation. Food in fish passes through the esophagus to the abdominal cavity, where the gastric glands are located and where the digestion of food begins. Then it passes into the intestines, where it is absorbed, that is, absorbed by the blood.

Fish of different species also have different digestive systems adapted to different types of food - from vegetable to other fish. But fish use food for exactly the same purpose as we do: as a source of energy for life, growth and movement.

The circulatory system of fish carries food and oxygen to all internal organs. The pump that regulates the blood circulation of fish, like in humans, is the heart. The heart of the fish is located behind the gills and slightly lower than them. It has three or four chambers, which, like ours, contract rhythmically.

There are thousands of different types of fish, each of which is adapted to certain living conditions, but their internal organs, senses and systems are similar to ours.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Who invented the elevator?

The elevator was not invented by any one person, but this idea has been developed over a long time. Mechanisms operating on the principle of an elevator have been used for many centuries.

The ancient Greeks lifted objects using blocks and winches. A block is a wheel with a groove along which the rope slides. A winch is a mechanism with a wider wheel or drum to which the end of a rope is attached. When turning the drum with a handle, the rope is wound or unwound from the drum. If the rope is passed through the block, it can raise and lower the load.

In the XNUMXth century, the "flying chair" was invented. It was designed to lift people to the upper floors of buildings and was driven by a system of weights and blocks. The chair and its mechanism were outside the building. However, the "flying chair" has not found wide application. In the first half of the XNUMXth century, the elevator already existed, but was used mainly for lifting goods.

Later, a steam engine was used to turn the drums of these hoists. Most of all, people were afraid that the ropes holding the elevator might burst, and the elevator would fall down. But when Elisha Otis invented accident-proof safety devices, elevators became very popular. At the same time, hydraulic lifts began to be used to raise and lower cabins, which use high-pressure fluid.

The electric elevator we use today was invented by the German engineer Werner von Siemens.

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Random news from the Archive

Women's brains age more slowly 16.11.2019

American researchers scanned the brains of more than 200 adults, analyzing their metabolic rate, which is known to change with age. As a result, the scientists found that the brains of women were on average three years younger than the brains of men with the same chronological age.

Experts suggest that having a younger brain provides women with some degree of resilience to the changes associated with aging. This, in turn, may help explain why women experience slower cognitive decline with age than men.

In the new study, experts led by Dr. Manu Goyala, assistant professor of radiology at the Washington University School of Medicine in St. Louis, scanned the brains of 121 women and 84 men, aged 20 to 82. They then created a machine algorithm based on data about the men's age and their brain metabolism. After that, the scientists entered data about women into the algorithm and programmed it to calculate the "metabolic age" of women. They found that, based on data from men, the algorithm calculated that the "metabolic age" of the women's brains was 3,8 years younger than their chronological age.

For the next step, the scientists created an algorithm based on data from women and programmed it to calculate the "metabolic age" of the men's brains. The algorithm determined that the men's brains were about 2,4 years older than their actual chronological age.

The main source of fuel for the brain is glucose. When people are younger, they release more glucose during a metabolic process called "aerobic glycolysis," which is thought to help brain development and maturation, including brain cell growth. But closer to 60 years, aerobic glycolysis reaches a very low level.

More research is now needed to better understand how the difference in "metabolic age" of the brains of men and women affects the risk of diseases such as Alzheimer's, scientists say.

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