The brain is a good thing, but not everyone has to have it...
Jellyfish have no brain. Its body is only a double-layer structure, like a plastic bag (cortex) in another plastic bag (stomach layer), and the middle of the two layers is glued by gel-like glue (medium glue layer). With such a simple structure, jellyfish have survived on this ever-changing planet for more than 600 million years.
Before humans ruled land by their brains, jellyfish dominated the unfathomable oceans without the need for complex brains or neural structures.
Sentence | Chino youko
This article is reproduced from the WeChat public account "Fruit Shell" (ID: Guokr42), the original text was first published on July 25, 2022, the original title is "No brain can dominate the ocean, how does jellyfish do it", does not represent the view of the Lookout think tank.
1 Flesh and bone made of water, but not vegetarian
In the book, Jia Baoyu has a saying that his daughter is flesh and bone made of water, and the man is flesh and bone made of mud. In fact, the average water content of adult men is about 60%, which is higher than that of women at 55%. Unfortunately, the world's men and women who are water spirits are not as good as jellyfish, some jellyfish water content can be as high as 98%, swaying in the sea, on the shore will become a pool of soft and soft, presumably Bao Yu brother will feel refreshing when he sees it...
Jellyfish look weak, but they are not easy predators, zooplankton, shrimp and fish are all prey of jellyfish. Most jellyfish have long, soft tentacles that are covered with spiny cells. In addition to jellyfish, corals, anemones and hydras also have spiny cells, so they are all classified as stingrays.
However, due to the fact that jellyfish have a wider range of activities than other spiny organisms, they often float on the surface of the sea and are pushed from the open sea to the beach by the waves, and the number of accidental injuries is more, and the lethality cannot be underestimated... Therefore, when it comes to spiny animals, many people first think of jellyfish.
The spine cells on the jellyfish tentacles are tiny and contain the stinger sacs that store the stings. When the spine cells are physically stimulated, a small number of stinging cells release the spines in the stinger sac and shoot at the prey in a very short period of time.
The fluids oozing from the prey after being stabbed will stimulate more spiny cells to emit spiny filaments through chemical reactions. The stingra will inject the jellyfish's venom into the prey, paralyzing the prey. Finally, jellyfish tentacles roll the prey into their mouths for chemical digestion, and a full meal is given to obtain the energy needed to survive.
Not only is the hunting efficiency amazing, but the shape of the stingers is also diverse, ranging from hollow spines like injection needles to spring-like curls that increase the ejection power, as well as viscous stingers whose surfaces are filled with mucus.
These deadly weapons of jellyfish, the stinging cell, are disposable and scrapped after use. At the same time, the constantly renewing spiny cells allow the jellyfish to maintain their combat effectiveness.
2 The living jellyfish is terrible, and it will not let you go when it is dead
Different jellyfish have different degrees of lethality. Most jellyfish stings are not fatal, but some jellyfish are frightening, such as the box jellyfish (which, as the name suggests, resembles a square box), is so poisonous that it can kill the injured person in a matter of minutes. Take, for example, Chiropsalmus quadrigatus, a box jellyfish common in Okinawa in summer.
After people touch the Bob jellyfish, they will feel the pain of electric shock, and in severe cases, they will faint or even die on the spot. This is one of the adverse reactions caused by jellyfish stinging poison into the human body.
Cases of redness and swelling at the site of the stab, such as a soldering iron burn or a scar after an electric shock, the victim's headache, vomiting, breathlessness shock and even death have been documented. This is because the toxins of the stinging cells are not the same, there are toxins that cause skin necrosis, there are nerve poisons that act on the respiratory center, there are toxins that cause hemolysis and death, and there are toxins that cause allergic reactions.
The scientific name of the jellyfish submen is Medusozoa, derived from the petrified Medusa in Greek mythology. In ancient Greek mythology, people who saw Medusa were transformed into stone by her magic.
Isn't it like a person who feels pain, unconsciousness, or even shock after being stung by a jellyfish and stands stiff on the surface of the sea or on the beach, just like the magic of the sea Mesa Dusha, the jellyfish?
In mythology, the great hero Perseus cut off Medusa's head and used the power of his head to kill the sea monster, turning his opponent into a stone statue. And after the jellyfish dies, the same power remains. Tourists see "jelly lying corpses" on the beach, and curious to reach out and tease the subsequent redness and swelling allergies, which also happen from time to time, because even after the jellyfish dies, the spine cells on the tentacles have not yet lost their activity, and they can still shoot out the spines with venom.
Or if you eat a squid and the squid happens to eat another jellyfish but doesn't fully digest the jellyfish, you may also be stung...
In fact, jellyfish do not mean to sting people, and some jellyfish spine cells cannot pierce human skin. But in short, when you meet a cute and dreamy jellyfish at the beach, don't touch it.
3 Fossils of thorns that have been "snubbed"
One jellyfish can kill you, but what about a bunch?
Most jellyfish often float lightly on the surface of the water, and their nearly transparent bodies are elusive in the sea. Whether out of curiosity or carelessness, there are always some divers or people swimming in the sea who are inevitably exposed to mines. A single jellyfish can kill a person, and if it's a group of jellyfish, it's worth it.
In the movie "Finding Nemo", in order to find his son Nemo, the clownfish father once walked through the jellyfish group. But in reality, the small fish that hit the jellyfish are not so lucky. When jellyfish gather, their long tentacles are like a net, and when small shrimp and fish pass through the jellyfish herd, they are usually swept away.
In addition, large numbers of jellyfish herds can also break fishermen's nets due to overwhelm, and make a large number of fish lose their economic value, even blocking the water intakes of coastal power plants, or causing beaches to close down...
What is even more frustrating is that many of the factors that cause jellyfish outbreaks - eutrophication of offshore waters, rising sea temperatures, overfishing of fish, invasion and proliferation that accompany ocean transportation, etc., have not yet been effectively solved.
Therefore, some scholars predict that in the future, jellyfish may replace fish to regain dominance of the ocean.
Jellyfish, seemingly weak but full of danger, no brain, but can already run amok in the sea with soft kegang, which is in response to a sentence of "simple but not ordinary".
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