Recently, in a short video posted by a netizen in Chaozhou, Guangdong, a headless scavenger swims freely in the water. Someone tried to pound its "head" with a finger. This "headless" "Yu" also shook his body a few times in response.
From the screenshots of the video, you can see that a scavenger without a head is swimming slowly. Its head section is relatively flat. It may be that someone cut off his head and threw it in after catching it. Feed the fish in the water. Who knows that this scavenger still hasn't stopped moving, swimming freely in the water. Netizens poked it with their hands, and it still reacted.
"I am a scavenger, although I am'junk', but very strong..."
"It seems to forget that he is'dead'..."
"It's terrible, no more The head is still alive, I am worried that it will invade the big rivers and small rivers..."
This made netizens lament the vitality of the sweeper. Scavengers are an alien species that was originally used for viewing, and they can eat organic waste produced by upper fish in the aquarium, where the "clean road" gets its name. This kind of fish likes to eat the eggs of other fishes and mainly lives in warmer waters. Scavengers were once introduced as ornamental fish and cleaning fish for sale, but some breeders let them go privately, causing the flooding of scavengers in the waters of southern my country. The scavenger is even half-dried in the sun, and may survive as long as it is thrown into the water.
It’s not the “patent” of scavengers to continue swimming after turning around.The scavenger’s vitality is tenacious, but the headless ability to swim has little to do with this problem. Some time ago, a netizen in Guizhou found a headless crucian carp in the river. The whole body is only half of it, but it is still swimming desperately, and judging from the wound healing, the headless fish seems to be alive. For a long time, netizens were very moved by its appearance, calling it "Fish Strong".
This phenomenon is more common in fish. When cleaning the fish in the vegetable market, they will knock a stick on the back of the fish's head, and then the fish will stop and become stiff. When slaughtering fish at home, especially live fish, sometimes some of the more vital fish, such as loach, catfish , etc., can swim even after the intestines are broken, and even beating after the pan. For people, this kind of scene seems a little bit scary, but because it is more common, there are not many people who are scared.
This phenomenon is not only found in fish, but also common in reptiles. After a snake is decapitated, the head and body can move separately, and the body has instincts such as entanglement. Can make holes on its own; and a headless chicken Mike once appeared in the United States. Its head was lost because of unknown reasons, but it survived for a year and a half. Of course, headless chickens are not the same as headless fish. The chicken is a warm-blooded animal. The owner of Mike feeds it with a dropper and feeds it with tweezers. It has only survived that long. Fish and reptiles are cold-blooded animals with slow metabolism and can live for a while without food.
can move without a head, which is unbelievable to humans, but it is more common for " lower animals ". Because their brains are too simple, they can only make simple judgments based on information such as vision and smell. There are some fixed behaviors stored in their brainstem. After environmental stimuli are triggered, they will have relatively fixed responses.In addition, there are nerve clusters that control the movement of the body in their spine, so that the body and the head can continue to move for a period of time after separation.
This situation usually occurs when the head is not completely destroyed or cut off. The scavenger in the picture above is only the head dropped. The head of the crucian carp below is destroyed by half, which may retain the relationship with the movement. Close to the brain stem, spinal cord and other important parts, so the body can continue to exercise for a long time. The metabolism of cold-blooded animals is slower, and cell tissue is also more primitive. Therefore, after losing its head (the fish gills can’t breathe), they can still continue to move for a certain period of time, but it won’t last long. Will not move at all.
And the kind of catfish whose gills and head are not removed after the intestines are broken can stay active for a longer time. In fact, this phenomenon can also be seen in mammals, but it is generally a local tissue. The mammalian brain and spinal cord nerves are further differentiated. The brain nerves participate in almost all movements. High paraplegia is caused by the destruction of the nerve conduction descending from spinal cord injury. The human brain wants to move the body, but the body cannot receive signals. However, local tissues can still respond to external stimuli, especially those activities that do not require brain nerve conduction.
The beating muscles are often seen in the slaughterhouse. The reason is the motor nerve in the muscle tissue, which can receive external stimulation to make the muscle tissue beating. In the functional experiments, one is to eradicate the gastrocnemius activity, which is to expose the leg muscles and nerves, and then use zinc tablets to stimulate the nerves, which is the gastrocnemius muscle will kick.
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