Why are there well developed blood vessels around the swordfish s huge eyes?

This is to give their brains plenty of blood, and yes, they respond a little faster.

They use their eyes to constantly search for prey, and they have well-developed blood vessels that are more conducive to hunting.

The better he catches the food, so that he has better strength.

For a quick search for prey in the sea.

This is to make their blood flow and breathe freely.

Because it needs an adequate temperature.

It has well-developed blood vessels, which means that it can provide it with better vision and make it easier to hunt for prey.

Blood vessels are full because you can see things better. Better capture of food.

Muscular people will have slightly damaged muscles after strength training, and a lot of nutrients are needed in the process of damage repair, and these nutrients need to be carried from the blood to the muscles, in order to be able to transmit more blood so that the muscles can get enough nutrients to repair, the blood vessels must be thickened, and the capillaries increase, of course, this is not visible. After the blood vessels are thickened, the blood vessels are naturally obvious.

Because there are many pigment cells hidden underneath the octopus**, which are filled with different colored liquids, and there are several dilators in each pigment cell that can make the pigment cells expand or shrink. When the octopus changes its emotions such as panic, excitement, and excitement, it will change color.

1. The octopus will change color, in fact, because there is a dispatch station in his brain, this dispatch station is responsible for changing the color of the octopus's body, there are two control areas in Mr. Octopus's brain, one control area controls the color of the head and wrists, and the other controls the color of the body, if one of them fails, then the octopus can only change color locally.

2. The octopus can change color because of the octopus's eyes that act as commanders. The octopus's eyes can first sense the changes in its surroundings, and will also send information instructions to the pigment cells at the first time, and by expanding and contracting the pigment cells, the octopus can continuously adjust its body color.

1. Catch prey. Octopuses can catch their prey by taking on the same color as clear water, sandy seafloors, or black rock crevices.

2. Hide from predators. When an enemy is approaching, the octopus turns a deep pink color and releases a cloud of black ink (called sepia) from the ink sac, which fades in color and flees quickly.

Octopuses are considered to be the most intelligent of invertebrates, with highly developed pigment-containing cells that can change body color very quickly.

The surface of the octopus is dotted with a type of cell called chromatophores. Each pigment cell contains one of four natural pigments: yellow, red, brown, or melanin.

These pigments can only be seen if the pigment cells are contracted. Octopuses can change their color by contracting only one pigment cell at a time.

Features of the octopus:

1. Octopuses are mollusks and have no bones.

2. The octopus has eight sensitively sensitive tentacles, each of which has more than 300 suction cups, and the pulling force of each suction cup is 100 grams.

3. The octopus relies on inhaling water into the mantle membrane and expelling the water from the body through a short funnel-shaped body tube for respiration. When an octopus is frightened, it squirts water from its body tubes and quickly moves in the opposite direction by means of a hydrodynamic jet to avoid danger.

4. Because the octopus can store water in the mantle cavity and live on oxygen dissolved in the water, it can live for several days without seawater.

5. The octopus is a sensitive animal, and its nervous system is the most complex and advanced of the invertebral propulsion, including the central nervous system and peripheral nerves, and the auditory, olfactory and visual nerves are divided into the cranial ganglia.

6. The octopus has no spine in its body, and it belongs to the mollusk phylum Cephalopod Octoplepoda, and does not belong to fish.

I often see some people with bulging green tendons on the back of their hands, which is terrible to look at, what are these green tendons, why some people can't see it and some people are very obvious? In fact, we see that the green tendons on the back of the hand are veins, and there is dark red fresh blood flowing in them, and the walls of the veins are white, and we are yellow**, so that the superposition of dark red, white and yellow becomes cyan in our eyes.

When the blood flows normally or our arm is basically parallel to the heart, the green tendons on the back of the hand will not be obvious. So under what circumstances will the green tendons on the back of the hand be particularly obvious?

There is less subcutaneous fat on the back of the hand

People who are emaciated will have very obvious blood vessels in their bodies, especially in summer or after excessive exercise, because the body's metabolism will speed up and blood circulation will increase, so the green tendons on the back of the hands will become particularly obvious, as long as the body is healthy, there is no need to worry.

Prolonged arm drooping or compression of blood vessels

If the arm hangs down for a long time, the local blood cannot circulate normally, and the hemodynamic force is insufficient to return to the heart, and the green tendons will be prominent. The compression of the local blood vessels in the arm will also lead to the obstruction of the venous return of the arm, and the blood return will slow down and accumulate in the venous vessels, and the blood vessels will bulge at this time, as long as the arm is raised or relaxed, it can return to normal.

Excessive physical exertion or exercise

Excessive physical exertion will lead to obstruction of blood return in the veins of the arm, and the pressure will increase, which will manifest itself through the blood vessels, and can gradually recover as long as the amount of exercise is reduced.

In fact, it is normal to have green tendons on the back of the hand, and when the arm is naturally sagging, because of the gravity of the blood gathering on the back of the hand, this situation will occur, and this situation will be more obvious when it is hot, so do not have any psychological burden in this situation.

The green tendons on the hands are particularly obvious and not some diseases, but just normal physiological phenomena, for example, some thin people have very little fat, so his green tendons are more obvious, and there are people who used to exercise often and muscular.

Because the green tendons are our blood vessels, the thickness of each person's blood vessels is different, so some people have obvious green tendons, and some people are not. The "green tendons" on the hands are particularly obvious, and under normal circumstances, it is not a disease, but a normal physiological phenomenon.

Some people have particularly obvious green tendons on their hands, because some people like fitness and often exercise, and some people often do some physical work, such as carrying things.

The green tendons are our veins, which may be due to excessive physical labor, resulting in faster blood circulation in the body and thicker blood vessels.

Because these so-called green tendons are blood vessels, and the thickness of each person's blood vessels is different, then some people are particularly obvious, and some people can't see it at all.

The troubles of contemporary young people, from time to time there are dark circles under their eyes!

The appearance of dark circles is often after staying up late, or it is not well rested, and there is the residual precipitation of the collection, and some are related to the body, but the first three reasons are generally caused by the most practical method, and it is also the method I have been using, is to use potatoes, cut a slice, and stick it on the dark circles My experience is that the thinner the better, the better, about 15 to 20 minutes later, take it off, be sure to clean your face before sticking, to prevent the cosmetics from being absorbed together, because potatoes contain starch, which has an inhibitory effect on melanin, and the effect is very good It's going to be pasted, and it's going to be much better the next day, and it's going to have a good effect.

(i) Congenital hereditary or acquired increased pigmentation of the eyelids; The patient's orbicularis oculi muscle is congenitally hypertrophied, or the pigment of the eye, and the congenital constitution is darker and more pigment than the adjacent parts, so the dark gray eye appears. (2) The eyelids are aging and sagging, and the appearance of skin tone is darkened due to wrinkled together; (iii) Shadows caused by the appearance of eye bags; (iv) The medial and inferior side of the orbit is sunken to form a tear trough (naso-jugal groove) and then a shadow; (5) Eyelid venous blood flow retention causes ** eye color to deepen. (6) Penetration of pigment particles in cosmetics For those who commonly use cosmetics, some dark-colored cosmetics particles may penetrate into the eyelids.

Over time, dark circles appear under the eyes. and a number of other reasons. Some of these causes may occur in combination.

There is a reflective film in the cat's eyeball, which is able to radiate the light behind the eye, so that the light can be reabsorbed by the retina, so that the cat's eyes look sparkling in the dark or at night.

The eyes of cats are not much different from human eyes, and they are also composed of structures such as cornea, iris, lens, retina, etc. At night, when a faint light hits the cat's eyes, we can observe that its eyes look sparkling in the dark.

This is because, like other animals that have evolved to hunt at night, cats have reflective films in their eyes that radiate light from the back of their eyes so that they can be reabsorbed by the retina, which is why their eyes look sparkling. Together with the elliptical pupil and large cornea and the velvet layer, the cat's eyesight is 6 8 times stronger than that of a human in dim light.

Studies have found that cats' eyes are quite special, and when the light is a little stronger, its eyes will be in a line; When the light is low, its pupils are dilated. Some people say that a cat's eyes will shine in the dark, and of course, whenever you see a cat's shining eyes in the dark, it will also make it feel scared and afraid.

In fact, scientifically speaking, the cat's eyes do not emit light by themselves, but have a reflector-like substance on the retina behind its eyeball, which can reflect the collected light energy. So we see that the cat's eyes are bright at night. This pupil of a cat is very elastic and its ability to contract is also very strong.

Therefore, the cat's vision is very keen, and it should be 6 times stronger than the human vision. This keen vision and wide perspective make it see a much larger range than others.

Then this extremely strong vision constitutes a necessary condition for its survival, and this starts from the role of the pupil, which is located in front of the lens, which controls the intensity of light entering the lens, and changes with the intensity of light from the outside. After the cat's pupils become larger at night, try to receive more shimmer light, but because of the convergence of the lens and the ciliary body, that is, the convex lens, the light converges in a small range, precisely because the pupil is large and the photoreceptor cells of people in the dark night are columnar cells, and the sensitivity is enhanced, so it is seen that it is bright.

A cat's eyes glow because it reflects light. The cat's eyes have a special mirror-like covering, which allows the cat to see clearly in the dark. This glittering substance can reflect the light of a flashlight or the light of a car headlamp, causing a cat's eyes to sparkle.

So, at night you will also feel that the cat's eyes are very bright.

Cats and cats, which belong to the feline family, are divided into domestic cats and wild cats, and are the most widely used pets in families around the world. The ancestors of domestic cats are presumed to have originated in ancient Egypt, the Persian cat of Persia, which has been domesticated by humans for 3,500 years (but not completely domesticated like dogs).

Ordinary cats: round head, short face, five fingers on the forelimbs, four toes on the hind limbs, sharp and curved claws at the end of the toes, and the claws can be retracted. Nocturnal sex.

Hunt other animals in ambushes, most of which can climb trees. Cats have fatty pads on the soles of their toes so that they don't make noise when they walk, and they don't startle mice when hunting. The claws are in a constricted state when marching, preventing them from being blunted, and they will stick out when catching rats and climbing.

The eyes of cats glow at night because there is a special liquid in the body of a mouse and this special liquid in the body of a fish, eating both mice and fish so the eyes of cats can glow at night.

Since the pupil of the cat's eyes can change with the intensity of the light, it will refract the light when there is light, so it will glow The cat's eyes cannot shine in the first place, please distinguish what is luminous and what is reflective cat eyes at night.

Because the eyes of the shrimp are composed of tens of thousands of hexagons, the vision is very good.

It may be that the body structure is different, and each eye of the shrimp is composed of tens of thousands of hexagons.

Because it has more color-perceiving proteins in its eyes than humans.

Because the eyes of the shrimp have a lot of color proteins.

According to scientists, Pipi shrimp can see 128 colors.

The photoreceptors of shrimp crickets are concentrated in the middle of the eye and are surrounded by some simpler cells.

It is able to recognize many colors that are invisible to humans, as well as different wavelengths of light.

Each eye is made up of tens of thousands of hexagons, and its vision is very good, and it is able to recognize many colors that are invisible to humans, as well as different wavelengths of light.

Sailfish is a river swimming fish, with a flattened, streamlined, muscular shape, and is the fastest swimming fish.

Yes, the swordfish is not only very fast instantaneously, but it can also maintain such a speed all the time because it has very high fins on its back, which minimizes the resistance of the body.

There are many fish that swim faster than sailfish, and the reason why these fish swim faster is because their skeletal development is different from that of other fish, and their swimming posture is closely related. Speed masters have their own talents.