Is it true that dolphin skin is changed every two hours?

Even if you don't use your brain, but think about it with your heels, it's impossible! Dolphins can't have that high metabolic rate, and in fact, no vertebrate is able to change every two hours**.

Dolphins do change every 2 hours**.

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The dolphin's ** is very soft, ** there are countless hollow protrusions on the outer layer, when swimming, the entire ** surface can be undulating according to the turbulence of the water, becoming consistent with the shape of the water waves, which reduces the friction resistance of the water by 90%. Therefore, the dolphin has a special organization, which is the main reason for its fast swimming speed.

The reason why the dolphin ** can eliminate turbulence, from the observation of its ** slice, it is found that it has the following characteristics.

The outermost layer is the epidermis, which is complete and seamless, delicate and soft, very smooth, elastic, does not absorb water, is sensitive to pressure, and can move up and down with the change of water pressure around the body. This layer of ** epidermis is actually a membrane that is very sensitive to pressure. Because the pressure of laminar flow on the animal body is uniform, turbulent flow is not, the pressure at the crest is high, and the pressure at the trough is small.

The skin of the dolphin acts as a buffer against this uneven pressure, which can propagate the pressure change of the turbulent current on the **, and make a wave-like movement with the turbulence, so that the turbulent flow becomes laminar flow, thereby reducing the frictional resistance of the water. Although at first glance it may seem like the dolphin's ** unevenness, it will create more resistance than a smooth surface. But this is not the case, because the wavy shape of ** coincides with the pressure of the water.

Dolphins have soft structures under their epidermis, which are suitable for such movements.

Underneath the epidermis is a spongy structure with many protrusions that are filled with fluid between them. This part of the structure is functionally like countless thin tubes filled with liquid, when the turbulent pressure changes, the liquid can flow out or flow into the thin tubes with the change of pressure, so that the ** shrinks or expands up and down, resulting in the so-called vibration. In this way, the liquid absorbs a portion of the turbulent energy as it flows with the turbulent pressure, thus eliminating turbulence in some parts of the body's surface.

The subcutaneous adipose tissue is well developed, which not only has the effect of protecting body temperature, but also provides the basis for elasticity and softness together with other surrounding tissues.

In 1960, someone imitated dolphins** in an experiment in which a rubber film with a thickness of 3 5 mm was attached around a slender object with a length of 114 cm and a maximum diameter of 6 4 cm, and dragged in the sea to measure its resistance. In the middle layer of the membrane, 2.5 mm thick, there are many small protrusions protruding inward, and between the protrusions are filled with attenuating oil. In other words, the outermost second layer of film is thin, the surface is intact and seamless, and it is smooth and soft.

The underside is supported by numerous dense, rubber-covered cylinders that form numerous tubes between them, filled with a liquid of the right viscosity as an absorbent to eliminate turbulence. In this experiment, four groups were used as control, and three groups A, B, and C were pasted with rubber films, but the characteristics of these three types of rubber films were different, and Ding was a hard model without rubber films. After experiments, it was found that the resistance of A was reduced by 35, B by 59, and C by 10, and the best effect was achieved in group B.

Experiments have shown that the better the elasticity of the membrane, the greater the effect of eliminating turbulence. He also tested the artificial dolphin skin on various diving devices and found that the turbulence was reduced by 50 percent. This ** can be used not only for ships in the water, but also for aircraft.

We all know that when driving fast and sharply in the water, there must be a lot of resistance, so how do dolphins overcome the resistance?

It turns out that on the surface of the dolphin, it is divided into three layers: the corneum, the epidermis and the dermis. On the dermis, there are numerous small hollow protruding tubes, inserted into the black inner layer of the epidermis.

Scientists use elastic special rubber to imitate dolphins, and specially make countless small and hollow protrusions, in which there are pores connected and a kind of mucus flows through the pores. Applying this sleek and elastic replica ** to a boat can indeed speed up the voyage without increasing the power and reduce the drag of the water by half.

Therefore, the special structure on the dolphin ** is an important reason for it to swim fast.

There is no body hair, it had body hair in ancient times, but after evolution it gradually disappeared.

There is no body hair on the current dolphin**, just smooth**, because dolphins have lived in the water since ancient times, jumping out of the water and then jumping into the water, the body hair is not suitable for it, it can be said to be a kind of redundancy, so the body hair slowly degenerates, and the dolphin without body hair has no body hair that has resistance to the water. That's why dolphins can jump so high now.

Got it.

It doesn't seem to be, but I'm curious, why ask.

Sea marrying is characterized by animals that can be mammated in water.

Dolphins are heavier but cute.

jjjjjjpjgagag'g'The Moonlight River in Pingtong City.

The dolphin's ** is very special, its ** has two layers of inner and outer layers, and the outer layer ** is particularly soft and thin, about a little more than 1 mm, that is, the thickness of ten sheets of white paper. But the inner layer** is very strong, this layer** is 6 mm thick.

And on the surface of this layer, there are many protrusions, that is, there are a lot of small bumps on it. These little bumps are like springs, making the dolphin's ** particularly elastic.

When the dolphin swims quickly, these small elastic bumps will make the outermost ** of the dolphin also uneven. This uneven ** can reduce the resistance of the water to a minimum, so the dolphin can swim so fast.

Dolphins are the best swimmers in the ocean, swimming at speeds of up to 40 to 50 km/h. So it can effortlessly leave other marine animals and ordinary ships behind and move itself through the water. The body of a dolphin is streamlined, which is a body shape that reduces resistance.

But more importantly, dolphin life went. Therefore, the whale still breathes with its lungs, because the whale is a behemoth and breathes with its lungs, so the air in the sea is far from satisfying its needs, and it has to surface every 10 minutes or so to breathe air. When a whale changes its air, it has to expel a large amount of air from its lungs.

When the air flows through the nostrils, it creates a strong pressure that causes the water to rush upwards and form a fountain-like jet of water.

Why do dolphins swim faster than other marine creatures? Popularize dolphin swimming!

The dolphin's body is streamlined to reduce the resistance of the water, and it also has a strong tail that creates a strong thrust. So the dolphins swim very fast.

Because we are familiar with dolphins, and we have always said that dolphins are friends of humans, people pay attention to them, and then find that they swim a little fast, and then they are exaggerated by the real society, so dolphins swim very happily!

It has a perfectly streamlined shape and** is very smooth, so the water has very little resistance to it when swimming in the water. Coupled with the natural body structure, it is a fast swimmer.

On the body of the dolphin, the slippery ** is not tight but elastic. As it swims, the dolphin shrinks**, creating a lot of small pits on it and storing water in it, thus forming a "water cover" around the body. When the dolphin swims quickly, the "water cover" envelops its body and moves at the same time as its body.

Thanks to this protective layer of water, dolphins swim with little friction and no whirlpools.

Because he has a very powerful tail fin, and the fact that its body is streamlined is purely hand-55555555

This is the principle of torpedoes: a smooth surface reduces the coefficient of friction.

The dolphin's ** is as light as satin, and the texture is like a sponge. The dolphin renews the cells of the outer layer every two hours to ensure that the appearance of countercurrent conditions is reduced, while allowing swimming speeds of up to 60 kilometers per hour and jumping from the water to up to 7 meters in the air. These excellent characteristics have been applied to the production of wetsuits and shipbuilding technology through the research of scholars.

1.Dolphins belong to the mammalian steel, cetaceans, toothed whales suborder, and dolphin family.

Dolphins can stay underwater for twenty or thirty minutes every time they change their air. So we'll see dolphins jumping out of the water for a while.