Why does the silk that a spider spits out not stick to its own feet

Spiders typically have 6-8 web webs at the end of their abdomen, and each textile has hundreds of spouts through which the silk is discharged. Spiders have glands with different functions corresponding to each spinn, and each gland produces a different raw material of silk thread, thus weaving both sticky and non-sticky silk threads. Scientists have found that the radial skeletal filaments (longitudinal filaments) on the spider web are very strong, but not sticky.

The spiral silk threads (horizontal threads) and dense water beads on the spider web are mainly composed of 4 sticky substances and 80 percent water, and their stickiness makes it difficult for insects to get out. When spiders move on the web, they choose to stay on longitudinal filaments that are not sticky, so as to avoid being stuck in their webs. In addition, the cobwebs are usually not perpendicular to the ground, and spiders touch the cobwebs with burred feet, and the whole body hangs from the cobwebs without touching the cobwebs, which also reduces the possibility of being sticked.

In case it encounters sticky horizontal filaments, the clever spider will perform a kind of "unique skill". Everyone knows that oiling is the best way to make the surface of an object non-sticky. Spiders secrete an oily substance that spreads it on their bodies, especially their feet, and it is this oily substance that keeps it from sticking even when it touches a horizontal filament.

There are two reasons for this:

The spider has a lot of silk pulp in its belly, and it has small holes at the end of its tail. Spiders often secrete a layer of oil from their bodies and feet, and sticky silk is non-sticky. However, ordinary flying insects do not have this layer of oil, so the spider web can firmly stick to the flying insects but not the spiders.

Although the spider's abdomen is small, it contains four [silk glands] that can produce seven different functions and properties. Two sets of warp and weft wires are used to catch insects. Warp yarn is dry silk with no stickiness, and weft yarn is sticky and will not be dried by the wind.

The spider usually only walks on the warp silk, and if it touches the weft silk, he will use his front paws and the oil on his feet to relieve his sleep.

Knowledge extension: (characteristics of spider silk).

Compared with silk, the physical and chemical properties of spider silk have very obvious advantages, in terms of mechanical strength, spider silk fiber is close to the highest strength of carbon fiber and high-strength synthetic fiber aramid, kelve, and other strengths, but its toughness is significantly better than that of the above fibers. Therefore, spider silk fibers have broad application prospects in the fields of national defense, military (body armor), construction, etc. Natural spider silk is mainly used in webs, and the yield is very low, and spiders have a cannibalistic personality and cannot be cultivated at high densities like silkworms.

In fact, the spider can also get snagged, but it knows how to avoid it. This has something to do with the silk that the spider spits out. Spiders can spit out two different types of silk, sticky and non-sticky.

Sticky silk is used to stick to flying mosquitoes. for catching prey; The non-sticky ones are used as spokes to support the net, which tend to be very strong. When a spider crawls, its eight legs secrete an oil that acts as a lubricant so that it doesn't get stuck.

After the spider catches the prey, it first wraps the prey with spider silk, paralyzes the prey with the venom in the tongs, and then spits out an enzyme digestive juice and injects it into the prey, and then sucks it in a big gulp after the protein-dissolving digestive juice completely turns the internal tissues of the insect body into juice. Since the components of the insect shell are not composed of proteins, they cannot be digested and dissolved by enzyme digestion fluids. As a result, the spider eats the leftover insect shell and is left intact in the spider's web like an empty canning box.

Nor can it be generalized. There are generally two types of spiders, one is the most common web-forming spider, which builds a web between the branches of a tree and uses it to hunt. The other is non-web-building, they wander around, looking for prey, and then kill the prey with their fangs, this is the nomadic spider.

When the cold wave is approaching, the hunting spiders will spin a lot of silk in the corners and start to weave a dense web, and then they will burrow into it, usually at this moment into hibernation, hibernation for a long time, until the end of the next spring. Web-forming spiders, on the other hand, generally die after laying their eggs in the fall. In the event of a cold wave, they will not form nets or spin silk, they will die.

Innate, because it feeds on silk, spiders don't spin silk, and it's not extinct.

There is a flying fish called"Flying Fish"But it won't fly far, and I believe that it will fly in a few hundred million years.

Because spiders are the "silk toads" of ancient times

Because a spider has a kind of silk in its body, it can spin silk.

Spiders can spin silk is an animal instinct, spinning silk can protect themselves, block enemy attacks when encountered, and at the same time can also use their spit silk to catch prey.

There are organs in the spider body that can spin silk webs, the abdomen of the spider has 3 pairs of protrusions, called the textile, there are many textile tubes on the textile and communicate with the silk glands in the body, the silk glands are at the back end of the abdomen, and are connected by many microtubules and the textile on the surface, which can secrete liquid-like bone protein, after the bone protein is sprayed out, it will harden when it encounters air, becoming silk threads, and layers of silk threads are woven into a web.

The principle of spider spinning:

There are six types of glands in the abdomen of spiders, called spinners, various glands produce different types of spider silk, and there are spinnerets at the top of the glands, on which there are thousands of small holes, and the liquid sprayed out condenses into viscous and tense spider silk when it encounters air.

Most spiders have venom glands, and there are two types of chelicerae and chelicerae that move up and down, and spiders that hunt on the ground and build webs in the air sweep like pincers. No antennae, no wings, no compound eyes, only one eye, generally 8 eyes, but there are also eyes, some genera even have no eyes, in terms of the color and function of the eyes, and divided into night and day.

The spider's silk does not come out of the mouth, but from the spinning machine, usually located in the back of the abdomen.

The spider spins silk mainly by the three pairs of protrusions at the back of the abdomen, which are its spinners. The spinning tube is adjacent to the silk gland, which can secrete liquid bone protein, which is very tough and elastic, and turns into silk threads when it encounters air. Many spiders can use silk threads to build webs, and when the prey touches the web, they will be cucked, and the spiders will eat the food that falls from the web according to the vibration of the signal wire.

Spider silk. Researchers have been studying how this occurs when it is in the abdomen as a liquid and when it comes out it becomes a solid filament. Spider silk is much stronger than steel of the same width, spider silk can withstand 5 times the weight of the same steel without breaking, and it can stretch up to 200 times its length.

The habits of spiders

Spiders feed on insects, other spiders, myriapods, and some spiders also feed on small animals. Jumping spiders.

Good eyesight, can dive within 30 cm to catch prey, pounce on it.

Crab spiders. Wait for prey on flowers of similar body color. Spiders burrowing in the earth build burrows lined with silk, and the entrance of the burrow has a trap that opens at night to prey on insects that pass through the hole.

funnel spiders weave funnel webs, and insects fall into the nets to cause vibration; The spider itself resides in a filament tube with a narrow end that leads into a plant or a crevice in a rock.

The spider's silk does not come out of its mouth. In fact, all the webs are not "spit out" from the spider's mouth, but are "pulled" by the spinners of the spider's abdomen. A spider generally has 3 pairs of spinners, also known as "looms", i.e., the front spinner, the middle spinner, and the rear spinner, each with a different role.

Of course, there are also spiders with up to 7 pairs, but there are very few of them. There are many spinning tubes on the spinners that are connected to the "silk glands". Whenever a spider needs to build a web, the silk fluid from the gland flows out of the body through an S-shaped spinning tube.

Silking processBefore forming a web, the spider must first find a fixed object to stick the silk liquid to it; Then, the spider moves its body quickly to pull out the sticky "glue", and once the silk meets the air, it will immediately condense into a sticky and tense spider silk.

Of course, spider drawing is also a technical activity, if the spider's movement is too slow, there will be no physical and chemical changes between the silk protein molecules, and it cannot form spider silk; Only when the spider moves at a certain speed will the silk protein molecules not have time to flow, they will be stretched apart to form new permutations and combinations, which will create a strong binding force and form spider silk.

The spider's silk is not spit out of the spider's mouth, it is pulled out

Spiders have multiple silk glands at the tail end of their abdomen, spider silk.

The raw material silk protein is usually stored in the silk gland in the form of a liquid. In addition, the spider has 3-4 pairs of organs called spinners in the abdomen, and its textile tubes communicate with the silk glands, and when needed, these fluids will flow out of the silk glands, through the textile tubes into the spinl, and then be expelled into the air. The spider silk, which was originally liquid, hardened quickly in the air and became the silk thread form that we see every day.

When making spider silk, spiders usually need to fix the silk liquid at one point and then move their bodies quickly to pull the silk liquid into a thread shape, so to be precise, spider silk is not spit out, but "pulled" out. If the spider silk is removed from the fixed point, or the spider's abdomen is immobilized so that it cannot move, the spider will not be able to produce the spider silk properly.

The strength of the spider silk

Someone has done a special study and found that the strength of spider silk is much higher than that of steel wire of the same thickness. Spider web.

It is possible to stop a fast-flying insect and remain unscathed, based on which it is estimated that a Boeing 747 in flight will be stopped.

All you need is a pencil-thin spider silk to do so.

Spider silk in elasticity, flexibility.

Heat resistance and UV resistance.

and other aspects of the performance is also very outstanding, by scientists called "biosteel". In addition, spider silk in clinical medicine.

Artificial organs also have a very wide range of application prospects.

The spider has a lot of silk pulp in its belly, and it has small holes at the end of its tail. When the web is formed, the spider spews out the silk. As soon as the silk pulp meets the air, it condenses into sticky silk, and with the web it forms, no matter what flying insects are, once they hit it, they don't want to run away again.

Spiders often secrete a layer of oil on their bodies and feet, and sticky silk is non-sticky. However, ordinary flying insects do not have this layer of oil, so the spider web can firmly stick to the flying insects but not the spiders.

Spiders will not vomit out their own silk, even if they build webs and vomit the spider silk temporarily, as long as they rest for a while, the silk pulp will be produced in the stomach again, and they can continue to vomit silk. They have a variety of glands in their stomachs that make silk pulp, and they are able to secrete a liquid bone protein, which is spit out of their bodies by spiders and condenses into spider silk that is both tough and sticky.

The formation of spider silk is actually not spit out by spiders, but is expelled from the abdomen by spiders, and spider silk is just a very viscous liquid when it is first discharged, and it quickly condenses into spider silk after contact with air. There are generally 3 pairs of spinning devices in the abdomen of the spider, and the spinning devices are connected to the silk glands in the body through thousands or even tens of thousands of tiny tubes, and the silk glands will produce various glandular fluids according to the different life stages and different needs of the spider, which will be stored in the stomach of the spider to meet the needs of the spider when the spider discharges these fluids to form spider silk for web-building, escape, making egg bags, predation and other needs.

When the spider wants to build a web, it will discharge the glandular fluid stored in the stomach through the spinning tube through the pressure in the body, and the glandular fluid will undergo chemical reactions and physical changes after contact with air, and it will quickly condense into silk threads. Spiders are very clever in the process of spinning silk, they will stick the discharged glandular fluid to a fixed object, and then move their bodies quickly, or let their bodies fall from the air, so that the spider silk is pulled out of the body to form a silk thread, if the spider is held down in the process, the spider cannot move quickly and cannot spit out the silk. This shows that the spider silk is not actually spit out, but is pulled out by the spider, and if the silk spit out by the spider does not start to fix its position, or if it cannot move its body, it will not be able to produce the silk.

Although the strong spider silk looks very delicate, it has excellent toughness and strength, and is called "biosteel" by scientists, and is the strongest natural fiber known to mankind. Even if a relatively large bee hits a spider web at high speed, the web will not be damaged by this impact force and will remain unscathed in most cases. The elasticity of spider silk is mainly due to the irregular arrangement of protein molecular chains in it, coupled with its strong viscosity, which makes spider silk look like a liquid spring.

No. Because spider silk is a special substance, and the spider's body can continuously produce this substance, the spider will not vomit its own silk.

The spider does not spit out its own silk, because if it spits out its own silk, the spider will also die, and of course it will not do that.

Spiders don't spit out all of their silk, spiders will keep some of it for prey or for emergencies, and won't use it all up.