Fish are human ancestors, why can t fish go ashore to breathe?

Although fish are the ancestors of humans, each population has evolved in a different direction, and therefore has different degrees of evolution in appearance and organs. It can only be said that some fish did not want to get out of the sea in the first place, so they cannot go ashore to breathe.

It has to be said that human beings have evolved for hundreds of millions of years to get to what they are today, although they are the ancestors of human beings, but they have no lungs and cannot breathe at all after coming ashore.

Because fish have become accustomed to swimming around in the water, so many years of mutation and evolution, so slowly adapted to the breathing in the water, so it is impossible to adapt to the land after a long time.

Because their organ composition is different, they cannot breathe in such an environment. After all, it is an aquatic animal, and its activities are very limited, and human beings have changed over a long time.

First of all, fish can breathe from the air!

The wisdom of the ancients tells us that fish float before it rains. We have inherited the wisdom of the ancients and made reasonable explanations. Before the rain, the air pressure becomes low and the dissolved oxygen in the water is insufficient. Fish will stick their heads out of the water to get oxygen from the air.

Physiology tells us that the fish float head absorbs oxygen through assistive respiratory structures such as the suprabranchial organs, oral mucosa, intestines, and air sacs. The main respiratory organ of the fish is the gills.

How do fish gills work?

1.Water enters from the mouth and then flows out through the gills. The direction of the water flow is exactly the opposite direction of the blood flow in the gill plates, forming a countercurrent exchange system that efficiently transports oxygen and carries away carbon dioxide.

2.The head of the fish has two large gill covers on either side, and the cavities on the gill covers are called the gill cavities. Lifting the gill cover, you can see that there are four gills on either side of the throat, each of which is divided into two rows of gill pieces. Each row of gill filaments is made up of a number of gill filaments, producing many small gill filaments on either side of each gill filament.

3.When the fish is in the water, each gill plate, gill filament, and gill plate is fully open to expand the gill contact area with the water, increasing the chance of absorbing dissolved oxygen from the water. There are microvessels in the gill sheets, and the epidermis is very thin.

As the blood flows through here, the gas exchange is complete: carbon dioxide is transported to the water through the thin walls of the gill sheets; At the same time, it absorbs oxygen from the water, which is transported to all parts of the body along with the blood circulation. Due to the alternating opening and closing of the mouth and operculum, water can continuously enter the mouth from the mouth, through the pharynx to the gill cavity, make contact with the gill filament, and then drain outward from the gill foramen.

The respiration of the fish is done in this process.

Fish breathe air. Barramundi, multifinfish, and arapaima all have primitive lungs. Loaches, eels, squid, etc. can also breathe air through the intestines and **.

If you specifically mention our common crucian carp, most of them die after a long time out of the water, you Chain Chain can tell you that they can also breathe air. The gills of fish have many gill filaments, which makes the surface area of the gills unusual. When leaving the water, most fish have their gill filaments stuck together, leaving a very small area in contact with the air.

Although gill filaments in contact with air can still breathe air, oxygen intake is insufficient due to the small contact area. Also, fish can constantly swallow in the water and expel water from their gills, but they cannot do so in the air, resulting in reduced airflow. There is a way of fishing among the people.

Those who are interested can see for themselves**. Because the gill cover of the bowfish is open, the gill filaments will also **, and the area in contact with the air is large, and the fish can survive on land for a long time. Many fish die shortly after leaving the water.

Abalone can live for a day or two.

Fish can't breathe on land, because fish don't have lungs, it breathes through gills in the water, and if the water nucleus is dry, the gills can't be moved, and the fish can't breathe.

No. Because fish do not have a respiratory system that can breathe on land, they cannot breathe on land.

No. The main reason is that the fish cannot obtain the oxygen that is insoluble in the water, so the fish cannot get enough oxygen on the shore of the cavity, and eventually die of lack of oxygen, and the fish can only obtain oxygen dissolved in the water.

It can't be because fish don't have lungs, the respiratory organs of fish are gills, and they can only breathe in water, and if they get on land, they will lack oxygen and can't survive.

Because the essence of biological evolution is to change the way they used to be, and in most traits they change, some are closely related, and some are distant. For example, modern humans are closely related to chimpanzees, but they are too far away from fish to find a place that is very close.

There may be no oxygen.

The respiratory system of fish is gills. On both sides of the head, there are two large gill covers, and the cavities inside the gill covers are called gill cavities. Lifting the gill cover, you can see that there are four gills on each side of the throat, and each gill is divided into two rows of gill pieces, each row of gill pieces is composed of many gill filaments arranged in an arrangement, and many small gill filaments are born on both sides of each gill filament.

When the fish is in the water, each gill piece, gill filament, and gill piece are fully opened, so that the gills are in contact with the water.

The area expands, increasing the chance of ingestion of dissolved oxygen in the water. There are microvessels in the gill patches, where the epidermis is very thin, and when the blood flows through it, the gas exchange is completed: the carbon dioxide brought by passes through the thin walls of the gill patches and is sent to the water; At the same time, it absorbs oxygen from the water, and the oxygen is transported to all parts of the body with the blood circulation.

Due to the alternating opening and closing of the mouth and gill cover, water can continuously enter the oral cavity from the mouth, reach the gill cavity through the pharynx, contact with the gill filament, and then discharge from the gill hole to the outside, and the respiration of the fish is completed in this process. So fish breathe by their gills.

<>1. Gills.

Most fish breathe with their gills. The fish you see in the vegetable market and the supermarket have their mouths closed and their gills closed. Open the gills of the fish to reveal the red gills.

There are a lot of capillaries on these gills. Although we can't see it, there is dissolved oxygen in the water. Every time the fish opens its mouth, the water will flow down the mouth to the gills, and the oxygen in the water will be absorbed by the capillaries in the gills, and the excess water will be discharged from the fish.

Second, the cheeks. > perch is characterized by its gills. The function of the gills is very simple, they can get rid of the unfavorable substances in the gills of the fish that can only breathe oxygen in the water, and can jump directly out of the water and breathe the oxygen in the land air. The body of the fish has a labyrinth-like organ, which is the gill.

The gills are not something that can be used at the birth of a small fish, and as they mature, they will also develop completely, and adult fish can breathe completely on the air above the water. Most climbing bass live in very small bodies of water, and there is not enough oxygen in the water for them to breathe. As adults, they can even jump ashore as long as they keep their bodies moist.

When the pond dries up, it will use its fins to walk onto land and move to the next place where there is water, but there is also a certain danger. In life, we often meet fish with gills, which is the black fish.

3. Lungs. The lungfish that outlived the dinosaurs breathed with their lungs. Barramundi has both gills and lungs. It can breathe with its lungs just like humans.

Barramundi lives in Africa, and during the rainy season it can live in the water like a normal fish. When Africa enters the dry season and the pond dries up, the barramundi will bury themselves in a hole of about 20 centimeters in the moist soil and go into dormant mode. During dormancy, only the lungs breathe and sustain life by depleting the muscles of the fish's body.

This can last for up to 3-5 years, until the pond reappears during the rainy season.

Fish breathe with gills. Since they live in water, they must take in oxygen from the water, so they need organs such as gills.

When the water flows through, the dense blood vessels in the gill filaments come into contact with the water flow, thus completing the exchange of gases.

Once out of the water, the gill filaments will stick together, so that it will not be able to take in oxygen, so it will gradually die of lack of oxygen.

Fish breathe by their gills. There are many capillaries on the gills of fish, and the walls of the capillaries are very thin, and gas can easily penetrate into them. In the water, the fish uses the mouth and gill cover to open and close alternately so that the water continues to flow through the gills, and the gill tribe He takes oxygen from the water and excretes dioxa-derivated carbon from the water.

The gills occur on both sides of the posterior end of the pharynx, mainly on the sides of the head. <

Fish breathe by their gills. There are many capillaries on the gills of the fish, and the walls of the capillaries are very thin, and gas can easily penetrate into them. In the water, the fish use the mouth and gill cover to open and close alternately so that water flows through the gills, and the gills take oxygen from the water and excrete carbon dioxide from the water.

The gills occur on both sides of the posterior end of the pharynx, mainly on the sides of the head.