Why do cockroaches survive without heads, and why do cockroaches survive until now?

It may be that the cockroach has no important organs in its head, and it has no effect if the head loses its nerves, so it could have lived forever, but it has no mouth, and it will starve to death. As a side note, I read a book that says that if the cockroach's head is gone, it can live for about 9 days. Endorse 5|Comments.

Cockroaches are notorious for their stubbornness, and people often sigh helplessly: even after a nuclear war, cockroaches can survive. Research proves that these people's feelings are not unreasonable.

Cockroaches have no head and can still survive for a week. At the University of Amherst in Massachusetts, USA, Joseph, a physiologist and biochemist who studied the evolution of cockroaches. Conk explained that understanding why cockroaches, as well as some other insects, can survive without a head, can understand why humans can't.

If a human is decapitated, it will immediately bleed, lower blood pressure, hinder the transmission of oxygen and nutrients, and cannot give the tissues needed to sustain life. Conk wrote: "You will die of excessive bleeding.

In addition, human breathing depends on the mouth or nose, and the brain controls these functions, so if you cut off your head, your breathing will stop. In addition, humans cannot eat without a head. But cockroaches don't blood pressure in the same way as humans.

"They don't have the same large network of blood vessels as humans do, and they don't need a very high blood pressure to make sure the blood reaches the capillaries," Conk said. They have an open-ended circulatory system that doesn't require high blood pressure.

He adds: "When you cut off their heads, the wounds on their necks will clot very quickly due to the action of platelets, so that they don't stop bleeding. Cockroaches breathe through the valves – they have small holes in each segment of their body.

Also, they don't need to go through the brain to control their breathing function, and their blood doesn't need to transport oxygen. They only need to pass through the valve duct to breathe air directly through the duct. Cockroaches are cold-blooded, which means they require much less food than humans.

Reasons: 1. Cockroaches, there is a title of "unbeatable Xiaoqiang", that is to say, the vitality of cockroaches is quite tenacious. Originating from the Devonian period, it is one of the oldest insects on the planet and lived in the same era as the dinosaurs.

According to fossil evidence, primitive cockroaches appeared on Earth about 400 million years ago in the Silurian period. Its vitality and adaptability have become more and more tenacious, and it has been multiplied to this day, widely distributed in all corners of the world.

2. A biologist once made a conclusion based on the ecological habits of cockroaches: if one day there is a global nuclear war on the earth, all living things in the affected area, including humans and even fish, will disappear, and only cockroaches will continue their lives!

Natural enemies of cockroaches: The natural enemies of cockroaches are spiders, scorpions, centipedes, ants, toads, lizards, geckos, etc. There is a bird:

The common name is Cucarachero (scientific name troglodytes audax), and it also preys on cockroaches. In addition, cats, monkeys and rats also prey on cockroaches and are the natural enemies of cockroaches.

Cockroaches are particularly tenacious, and there is no natural death in autumn and winter. However, autumn and winter, especially just after heating, is the best time to exterminate cockroaches, if the density of cockroaches in the family or unit is high, you can take the opportunity to exterminate cockroaches.

Cockroaches like to congregate in warm, humid, well-fed and crevice-populated places, so after central heating, cockroaches will "move closer" to the heating equipment. During the period before heating, cockroaches tend to gather behind appliances that can dissipate heat, such as refrigerators, microwave ovens, ovens, and water heaters. In addition, the kitchen is also a place with a high density of cockroaches because of the abundance of food.

Even when there is no food in the living environment, cockroaches can survive by nibbling on confetti. Therefore, cockroach extermination is a long-term project, and home cockroach extermination does not need to wait for the best time, and can be found and sanitized at any time.

It should be said that each species has its own unique way of survival from ancient times to the present. Cockroaches are not very able to adapt to all kinds of harsh environments and have a strong fertility rate, so it is not unusual for them to survive until now.

Because he lived hundreds of millions of years ago, he had it, and even if he killed her, the eggs in her abdomen would be born, and the cockroaches would eat his corpse, and he would regenerate a bunch of cockroaches, and the cycle would continue indefinitely, so he could live until now.

Generally speaking, all species that can survive until now are species with strong vitality and adaptability, so that they can survive in the process of evolution and survive until now.

01 Many insects, such as cockroaches, can indeed live for a long time with their heads removed, even up to a month under laboratory conditions. However, in the actual environment, cockroaches with missing heads will quickly become infected and die due to the dirty environment.

Joseph, a physiologist and biochemist who studied the evolution of cockroaches at the University of Massachusetts Amherst in the United States. Conk explained: not only cockroaches, but many other insects can live for a long time with their heads removed.

He compared a headless cockroach to a headless human:

1.If a human is decapitated, he will hemorrhage to death, but the circulatory system of insects is different from that of humans, it is an open tube circulation, and when the head is cut off, the wound on their neck will be quickly blocked by the action of sac blood cells or podocytes (similar to the role of human platelets), so that the blood does not stop.

2.Human breathing relies on the mouth or nose, and the brain controls these functions, so when the head is cut off, the breathing stops. Insects, on the other hand, breathe through the valves in their abdomen, and they don't need their brains to control their breathing, and their blood doesn't need to transport oxygen.

They only need to pass through the valve duct to breathe air directly through the duct.

3.Cockroaches belong to ectotherms and do not need to expend energy to maintain their body temperature, which means they need much less food than humans. They can survive for weeks with a single meal.

And after the head is removed, the cockroach will stay there honestly and will not run around, which can reduce physical exertion. Under laboratory conditions, as long as they are not exposed to predators and their wounds are not infected by bacteria or viruses, they can continue to live for even a month until they starve to death.

However, this seemingly awesome ability has little meaning in people's lives. Because the cockroach's head is small, hidden under the dorsal plate of the front chest, and there is a sensitive antennae detection danger, even if it is accidentally injured, it is almost impossible to leave the whole body intact and only the head will fall off. Even if it does fall, with the dirty environment in which it usually lives, the wound will quickly become infected and die.

If a female cockroach carrying an egg sac falls off its head, her eggs will still hatch. Because the eggs are mature from the moment they are laid, they no longer need to get nutrients from the mother. Even if you split the egg-holding female, as long as the egg sac is not broken, the eggs inside will hatch normally.

It's just temporary, and it won't last long.

Why do cockroaches survive for a week even if they don't have a head? Xiaoqiang is not called for nothing.