Yes, you heard me right. It is scientifically proved that pregnant women are the biggest enemy of embryos, and maternal love stems from a cruel struggle.
19 14 years, scientists conducted an experiment that shocked the world, enough to subvert our cognition. They injected bovine embryos into the cow's head to observe how the embryos outside the uterus take care of themselves.
Surprisingly, embryos grow wildly in the brain of cattle, plundering nutrients crazily, and even growing except placenta. Soon, the nutrition of this cow was squeezed out and it was in danger.
Scientists saved the cow by surgically removing the embryo. Scientists suddenly realized why people produce a large number of lymphocytes after pregnancy.
It turns out that in this battle, the mother also has to clean up the embryo!
As we all know, a fertilized egg is a combination of a female egg and a male sperm. For the mother, half of the fertilized eggs are "strange genes" and have not been passed. If a fertilized egg is to be implanted in the uterus, the mother will produce immune substances and want to expel them.
Embryo will not sit still, it will secrete a kind of human chorionic gonadotropin, commonly known as HCG, to protect itself from maternal attack. HCG value is also an important index to judge whether you are pregnant in the first trimester.
In the second trimester, in order to get more nutrition, the fetus will secrete hormones, which will increase the maternal blood pressure and blood sugar and make more nutrients flow into the placenta of the uterus.
In this process, the fetus will not care about the safety of the mother, so many pregnant women suffer from severe pregnancy-induced hypertension and gestational diabetes.
The third trimester is the white-hot stage of the struggle between mother and baby. Placenta will dig its roots deep into the uterine wall like a tree for better growth and development. There is a medical term for this condition called placenta accreta. What is even more frightening is that this situation will lead to massive bleeding of pregnant women when it is serious.
It turns out that all human behaviors have been written in the genetic code. The struggle between mother and baby is far from over. A paper published in Evolution, Medicine and Public Health pointed out that crying at night is not necessarily hunger, but it consumes her mother in this way, making her have no energy to get pregnant, and she has to occupy all the food and love.
In Australia, there is a kind of spider called the mother-eating spider. Female spiders go out hunting to increase fat reserves, while young spiders absorb nutrients from female spiders' thighs. The little spider's madness will make mom exhausted. Finally, the little spiders injected venom into her mother and ate her separately. You may not want to believe it, but genetic codes are ubiquitous struggles, and their only purpose is to survive and reproduce.