Starfish have ducts distributed on each wrist, what do these tubes do?

The monitor is "covered in echinoderms – starfish with a peculiar star-like body, usually with five long antennae on its disc-shaped body, but unable to see its eyes. People often think that starfish rely on these antennae to identify directions, but this is not the case. Research by scientists from the United States and Israel has found that starfish are "monitors" all over their bodies.

Originally. <> starfish have many tiny crystals on their spiny derm**, and each crystal functions as an eye to get information about its surroundings. Scientists dissected starfish and found that each tiny crystal on the starfish's spiny skin is a perfect lens, known to be much smaller in size than a lens made by humans using existing technology. The myriad lenses in the starfish echinoderm are light-concentrating, allowing the starfish to simultaneously observe information from all directions and keep abreast of its surroundings.

Prior to this, scientists thought that starfish echinoderm was highly photosensitive.

It can determine what kind of concealment measures to take by changing the intensity of light around its body, and it can also change its color to confuse its "enemies". Scientists say this unusual visual system on a starfish has been discovered for the first time. Scientists**, the imitation of this tiny lens will lead to a breakthrough in optical technology and printing technology.

Regenerative ability. The starfish's trick is that it has a doppelganger. If you tear the starfish into several pieces and throw them into the sea, each piece will quickly regrow the lost part and grow into several new and complete starfish.

For example, a sand starfish can grow a complete new starfish with a one-centimeter-long wrist, while some starfish are more capable and can grow a complete new starfish with just one stump arm. Starfish's wrists and body discs are damaged or self-cut, and they can regenerate naturally. Any part of the starfish can regenerate a new starfish.

These catheters are used to deliver nutrients while still eating.

It also acts as a surveillance, transporting oxygen and food.

It plays a role in transporting oxygen and nutrients.

It is filled with gonads and digestive glands, and there is an open step groove below the wrist that communicates with the mouth.

You can feel the changes in your surroundings and even the danger.

Transports nutrients and oxygen throughout the body.

This is to deliver nutrients.

Transports blood and oxygen, as well as nutrients.

It is filled with gonads and digestive glands.

Much like a pentagram, starfish feed on crustaceans. Starfish are phylum echinoderms. Starfish have a peculiar body, the body is like a disk, there are 5 long tentacles like a pentagram, also called a starfish, starfish are widely distributed, there are starfish in the world's oceans, they live in the intertidal zone and near the shore of the calm sea.

Most of them inhabit the lower layers of the coast or on the shores of deep waters. There are many kinds, there are more than 50 kinds in our country, there are Roche sea panche like a five-pointed star, bread starfish with a convex hat, petrel with short wrist and blue color, chicken paw starfish with thin wrists like claws and lotus leaf starfish like lotus leaves. Starfish are bright in color, mostly bright red, dark blue, rose, orange, some will be dotted with purple insect patterns and trim on a pink base, and some will have red edges in blue.

Starfish can change their body color as the environment changes, forming a protective color.

It is also called a sea disk car. The position between the proto-oral and posterior oral animals.

In people's minds, sharks are the most advanced carnivores in the ocean, but it is incredible that starfish, which usually inhabit the sand or reefs on the bottom of the sea, are also carnivores. Since starfish are not as mobile as sharks, and therefore not as agile as sharks, starfish are not targeted at slow-moving animals like them, such as shellfish, sea urchins, crabs, and sea anemones. It often adopts a slow and winding strategy of predatory, slowly approaching its prey, catching it with its wrist tube foot and enveloping its whole body, spitting the stomach pouch out of its mouth, and using digestive enzymes to dissolve the prey outside its body and be absorbed by it.

Starfish occupy an indispensable link in the marine food chain, and its predation plays a role in maintaining the balance of the biota, such as the sea rainbow (Tancai) that is densely clinging to the reef on the West Coast of the United States. In this way, it is possible to prevent the overbreeding of the rainbow and prevent the rainbow from encroaching on the territory of other organisms, so as to maintain the balance of the biota. There are about 2,000 species of starfish in the world, which are found in a vast area from the intersea belt to the bottom of the sea.

Among them, the northeastern Pacific waters from Alaska to California are the most widely distributed.

In the food chain of nature, there is often a life-and-death contest between predators and ** eaters. In order to escape the predation of starfish, ** food animals can almost all make an escape response. There is a sea cucumber that rolls violently in the water whenever a starfish touches it, fleeing before it is firmly grasped.

The scallop also has a unique way of avoiding starfish, as the scallops swim away quickly when the starfish comes close to them. There is a small anemone that detaches from the reef it clings to and drifts to safety whenever the starfish approach it. The evasive abilities of these animals are developed from a long period of evolution.

Avoided the fate of being eliminated by nature.

Tiger poison does not eat children, although starfish are a very ** carnivore, but they are still very gentle with their children. Starfish usually raise their wrists after laying eggs, forming a protective umbrella that allows the eggs to hatch inside and avoid predation by other animals. The hatchlings drift around the sea, feed on plankton, and eventually grow into starfish.

Starfish mainly live on shellfish, and when preying on shellfish, starfish will use a powerful suction cup to pry open the shell, and then eat the shellfish flesh, so the danger of starfish to shellfish farming is great. Shellfish are rich in nutrients, but the nutritional value of starfish itself is not very high, and it is generally dried to make flour and used as fertilizer, but the ornamental value of starfish with different postures is still very high.

1. The structure is different

The duct is a tubular structure in the xylem of the plant, which mainly transports the water and inorganic salts absorbed by the roots to all parts of the plant's body. The duct is composed of a string of tubular dead cells, only the cells of the cell wall, and the upper and lower cells are through;

2. Different functions:

When the water and inorganic salts absorbed by the root hair cells from the soil enter the ducts of the roots through a certain way, the plants transport the water and inorganic salts to the whole body of the plant through the ducts in the roots, stems and leaves.

The sieve tube is a pipe that transports organic nutrients in the phloem (inner side of the bark) of the plant, and is formed by many tubular living cells connected up and down, and there are many small holes in the transverse wall of the adjacent two cells, called "sieve holes". The protoplasts of the two cells communicate with each other through the sieve pores, the sieve tube does not have a nucleus, but the sieve tube is a living cell, and the organic matter made by the leaf is transported downward by the sieve tube.

3. Microstructure:

The ducts are made up of dead cells and are tubular with a cell wall that contains lignin and is therefore hard. The cell wall at the junction of the upper and lower junctions disappears, forming a hollow tube.

Sieve tubes are tubular and thin-walled, viable cells with cytoplasm but no nucleus. There are many small holes (sieve pores) in the cell wall where the upper and lower parts of the cell meet, called frit plates. The cytoplasm between sieve tube cells can be connected through the sieve pores.

1. Duct: The pipeline for transporting water and inorganic salts in the xylem of the plant body is composed of many cylindrical cells with disappearing transverse walls connected up and down, and the liquid can flow in the tube. Roots, stems, and leaves all have ducts and are connected.

Water and inorganic salts and other substances dissolved in water are generally transported from the bottom up.

2. Sieve tube: the pipeline for transporting organic nutrients in the phloem of the plant body, which is composed of many cylindrical cells connected up and down.

There are many small pores in the transverse wall of the upper and lower adjacent cells, called ethmoid pores. Roots, stems, and leaves all have sieve tubes and are connected.

It can transport substances in both directions, and mainly organic matter is generally transported.

The direction of movement of the matter is different: the catheter is from the bottom up. The sieve tube is top-down.

The ducts are used to transport the water and inorganic salts absorbed by the roots, and the sieve tubes are used to transport the organic matter produced by photosynthesis.

Duct: The long-distance transport system of water and inorganic salts in the xylem of plants composed of columnar cells, which transports non-organic matter. Screen:

A tubular structure in the phloem. It is composed of sieve molecules, which are responsible for the long-distance transportation of photosynthetic products and a variety of organic matter in the plant body, that is, the transport of organic matter.

The catheter is mainly responsible for transporting water, inorganic salts; The sieve tube is responsible for transporting organic matter, mainly the product of photosynthesis.

The duct transports the water and inorganic salts absorbed by the roots upwards.

The sieve tube transports the organic matter produced by the plant leaves in a top-down direction.

The difference between a plant sieve and a conduit.

1. Physiological activity: The sieve tube is composed of living cells, and the duct is composed of dead cells.

2. Physiological activity: The sieve tube is composed of living cells, and the duct is composed of dead cells.

3. Physiological function: the sieve tube mainly transports organic matter, and the catheter transports water and inorganic salts.

Starfish live underwater, but that's where they resemble fish. Starfish aren't really fish. They don't have gills, fins, or scales, and they're actually related to sea urchins, sand dollars, and sea cucumbers, which are all echinoderms.

Starfish have different body chemistry that makes them unsuitable for fresh water, and as a result, they prefer salty water. They have always preferred to stay in saltwater environments in order to survive, and tend to suppress coral reefs, moist sandy areas, and other saltwater areas. If you accidentally put a starfish in fresh water, it will eventually die.