Human sperm quality declines
Good seeds are necessary for the healthy growth of crops, and healthy sperm is indispensable for the healthy growth of children. However, for nearly half a century, the sperm that humans rely on to transmit has undergone an extreme decline, giving humans a red light. This slide is caused by humans themselves, which is equivalent to the suicide of extermination of human species.
Men's sperm begin to "decadent"
One data shows that in the past 50 years, male sperm has decreased by almost half, and is still decreasing at a rate of 2.1% per year. According to statistics, in the 1940s, men had an average of 130 million sperm per milliliter of semen, which has since decreased to 66 million. In 1960, 5% of men had fewer than 20 million sperm per milliliter of semen. During the 1970s and 1980s, the number of males with sperm counts of less than 20 million gradually increased. By the 1990s, the world's environmental pollution was becoming increasingly serious, with the rate soaring from 5% in the 1960s to 15%. To successfully fertilize an egg, 20 million sperm is far from enough.
At the same time, the quality of human sperm is also quietly declining. The proportion of malformed and inferior sperm is increasing, and its vitality, penetration, and pregnancy rate are decreasing. As a result, the proportion of male infertility is also increasing year by year. According to some statistics, in 1960, only 8% of men came to consult because of infertility, but now it has reached over 40%. In the 1970s, the proportion of male to female infertile patients was 3 to 7, and in the 1990s, the proportion had risen to 1 to 1.
For this reason, authorities have issued a warning: If effective measures are not taken in a timely manner, and if this continues, within a century, the sperm that humans rely on for lineage will seriously decline, and it will be difficult for humans to reproduce!
Don't let sperm become a museum "collection"
The decreasing number of sperm directly threatens the quality of human reproduction. This has caused anxiety and unease among experts around the world. What is the reason for such a bad trend? After years of clinical observation and research, scientists have found that the deterioration of the external environment such as chemical pollution, radiation, electromagnetic waves, and noise is like a fierce killer for human sperm. Various physical, chemical, and biological harmful factors not only cause cancer, but also quietly endanger the continuation of human race. Perhaps one day in the future, when human sperm is "cut off", we may only be able to see the human seeds that once multiplied in museums.
1、 Male sperm maladaptation
Y chromosome "competitive laziness"
The reason why men are male is determined by the y chromosome. However, although men are strong, their y chromosome is weak. Recent studies have found that the male specific y chromosome is dying out. Three hundred million years ago, the y chromosome was born with 1438 genes. But only 45 genes remain in evolution today. At this rate, the y chromosome will completely disappear after 10 million years. With the Y chromosome gone, will there still be men in this world?
Chromosomes are carriers of genes. Human cells have 23 pairs of chromosomes. It includes 22 pairs of autosomes and 1 pair of sex chromosomes. The sex chromosomes include the x and y chromosomes, which determine the gender of humans. The male sex chromosome is xy, while the female sex chromosome is xx.
Compared to the industrious and powerful x chromosome, the male specific y chromosome appears lazy and short. Not only is it less than one-third the size of the x chromosome, but most of its DNA sequences are nonfunctional, and the genes involved in "working" are even less than one-tenth the size of the x chromosome. Genes determine the various characteristics of an organism, and their number can reflect the "influence" of chromosomes to a certain extent. So the y chromosome, which lacks genes, appears to be very weak.