Like all living organisms, humans need to reproduce in order to exist as a separate species. It would seem that there is nothing complicated in this process, but in reality everything is somewhat different. The fact is that conception can not be carried out every day, and the subsequent development of the child in the womb is multi-stage and very complex.
Conception
In fact, the fertilization of an egg by a sperm can only occur on certain days. In each menstrual cycle of a woman, there are only 1-2 suitable days. Taking into account the fact that spermatozoa, before reaching the ampullar part of the fallopian tubes, where the fertilization process takes place, must go through a rather difficult path that promises death for the vast majority of them, the chance of conception is not so high.
After fertilization is still carried out, the resulting zygote is gradually directed towards the uterus. During this journey, the gradual growth of the zygote occurs. Approximately on the 10th day, the embryo enters the uterus, where it is introduced into its wall. After that, the embryo gradually grows and develops. It should be noted that the firstThe periods of development of a child in the womb are associated with great risks for him. So human reproduction is a rather complicated multi-stage process.
Childbirth and its dangers
One of the highlights is the birth of a child. It promises a large number of dangers to both the mother and the child. Fortunately, the development of modern medicine makes it possible to save the mother's life in almost 100% of cases, even in the most difficult situations. As for the child, everything is somewhat more complicated with him, but now there are already many different technical means that can help save the life of even the weakest baby. Thanks to this, human reproduction and development has become an easier process.
The danger of childbirth lies in the possibility of damage to the tissues of the mother and child, as well as in hypoxia (lack of oxygen). In order to avoid this, gynecologists use special techniques to help the child pass through the birth canal. As a last resort, a caesarean section is performed.
Demographic issues
Biology can tell how a baby develops in the womb and is born. Human reproduction on the scale of the whole species or a separate population is studied by demography. It makes it possible to identify emerging trends in the change in the population size and its sex and age composition. This allows you to take the necessary action.
Today, in many developed countries, there isgradual decline in population. This is due to the fact that human reproduction here is subject to a large number of laws and restrictions that each individual person sets for himself. People in highly developed countries prefer to first resolve all issues related to their careers and only then think about children. As a result, human reproduction occurs predominantly between the ages of 30 and 35. In addition, the population of such countries prefers to "live for themselves" and have only 1 child.
So, modern human reproduction as a species has its own characteristics. Only time can show what trends will emerge in this area in the future.
