Parasitism refers to two different organisms living together, one benefits and the other suffers, and the victim provides the other with material and place of residence. First of all, the fetus needs a lot of nutrients to grow. It grows from an embryo and then develops into a fet

All fetuses want to kill their mother when they are in their stomachs. Do you believe that the fetus is a parasite of the mother? Ten months pregnant, a "palace battle" drama was staged. The fetus and the mother are actually in a competitive relationship. Don’t leave the ignorant, and you will take you to see the world from another perspective.

寄生是指两个不同的生物生活在一起，两者一个受益一个受害，受害方为另一方提供物质和居住场所，首先，胎儿生长需要很多的营养，它从一个胚胎，然后发育成一个胎儿，身体各个器官都要生长，所需营养只能从母体上索取，胎儿在母体时，只有一个目标，就是“活下去”跟母体抢夺营养，所以，母体在怀孕之后，会出现大量DHA流失，记忆力下降、呕吐等不适反应，都是因为将自身的营养物质提供给胎儿生长导致的。

During pregnancy, pregnant women may experience hypertension , hyperglycemia , and their resistance is not as good as when they are not pregnant. This perfectly confirms the parasitic relationship between the mother and the fetus. When the fetus is in the uterus, it will constantly compete with the mother for nutrition. Although the mother wants to provide more nutrition to the fetus, the fact is that the mother's body is competing with the baby for nutrition all the time. The large number of lymphocytes in the uterus are to inhibit the embryo and are a protective mechanism created by the mother after feeling the threat.

We all know that eggs do not grow up in the uterus, but are first discharged from the mother, combined with the sperm to form a fertilized egg, and find a suitable position in the uterus implantation . There are half of the genes of sperm, not the mother's own genes, so the mother will produce rejection and immune responses, which is one of the reasons for the mother's discomfort. The embryo will also turn on defense to prevent itself from being killed by the immune system. The embryo will secrete a hormone called HCG, which can inhibit the attack of the mother's lymphocytes until the mother treats it as a normal organ and continuously passes through the placenta to transport nutrients to it. In order to seize nutrients, the fetus will let more blood nutrients flow into the uterus. Therefore, pregnant women will experience symptoms such as pregnancy hypertension and hyperglycemia. So what countermeasures did the mother take in the face of such an aggressive fetus? Let’s continue to see that

women’s menstruation is actually the result of the uterus fighting against the embryo. This statement was proposed by Dina Emmara, a Yale University student, in a paper published in 2011. In the late stage of pregnancy, the fetus needs more nutrients. In order to keep itself alive, the placenta will automatically decompose and go deeper from the base of the uterus to the endometrium, which will easily cause major bleeding during childbirth, shock and other dangers. In order to protect their safety, the mother also has a trick. In order to prevent the mother from being threatened by the baby, she retains the right to be a mother. At the same time, in order to adapt to the placenta falling off during giving birth, the woman's uterine membrane will fall off once a month, which will form a woman's menstruation.

The existence of menstruation may be to better resist embryo invasion. Menstruation, which seems useless and troublesome, is actually a necessary means for the female body to protect itself. All fetuses in the world will absorb nutrients from the mother's uterus, but the degree of depth will vary from species to species. For example, the embryos of animals such as cows and horses are only located on the surface of the uterus, but human embryos almost penetrate the entire endometrium. On the surface, the mother will undergo a series of changes in order to implant the embryo. For example, the endometrium becomes thicker every month, which is like providing fertile soil for transplantation for the embryo. But in fact, uterus does this, and may not want the embryo to implant. After all, after the placenta is implanted into the mother, the hormones in the mother's body will be fully controlled by the placenta.

There is also evidence that scientists try to peel the mouse's embryo from the uterus and then place the embryo in cultivation elsewhere. In this experiment, the embryo can easily implant on the mouse's chest, abdomen and even the back, but the embryo in the endometrium is difficult to take root. This shows that in order to prevent embryo invasion, the mother will make the endometrium thicker to resist the invasion of the embryo. From this we can see how fierce the struggle between the fetus and the mother is. But these are all modern, so do you know how to give birth to a child when there was no high-tech in ancient times?

Why was the mortality rate of having children so high in ancient times? What should they do if they have difficulty giving birth? In fact, there was also a caesarean section at that time. I believe everyone has heard of the lines in the TV series, "Master, the wife has difficulty giving birth, so protecting the adults or protecting the children." In ancient times, the fate of the mother and the fetus was generally in the hands of the husband. When a woman gave birth, she was stepping into the gates of hell with one foot. This was not an exaggeration, let alone in ancient times when medical technology was backward, there were too many cases of pregnant women dying of difficult labor.

So what are the main reasons for the difficult delivery of the ancients? Judging from the factors of pregnant women themselves, the first reason is that the pelvic bones of pregnant women are too small, and the pelvis is a key component of the birth canal. When a woman becomes pregnant, the pelvis will become loose due to the hormones secreted by the body, which is convenient for delivery. However, some women's pelvis is deep and narrow, and it is difficult for the fetus to give birth smoothly. So how did this problem be solved in ancient times? If you keep small, an experienced midwife will break the fetus' clavicle, reduce the volume, and then pull out the newborn. The clavicle healing ability of the newborn is very strong, so there is no need to worry.

If the midwife is inexperienced and is forced to take the child, it may cause the child to suffocate and the mother to bleed heavily, and thus there will be a situation where one corpse and two lives in the film and television drama. If the midwife is maintained, regardless of the life or death of the fetus, she will use scissors, iron hooks, etc. to differentiate the fetus and pull it out of the mother's body. Although this is cruel, under the medical conditions at that time, the mother's life can be saved to a large extent. You must know that the newborn is not conscious yet. There is no awareness of pain. Although cruel, there is no other way. After all, in that era, I don’t want to say it. Finally, I have to sigh. Although we are very excited about the birth of a new life, the process of pregnancy and childbirth is extremely painful. As a key role in human reproduction, mothers use the nutrition and blood of their children to support their children before they are born. After they are born, they regard them as more important than life. How great is maternal love. I can't continue talking, leave a message in the comment area, like and follow, see you next time.