In order to give birth to a new life, sperm really has the spirit of going forward one after another and not being a hero until you reach the Great Wall!
Although women have created many favorable conditions to welcome the entry of sperm, sperm still must rely on their own efforts to complete the task. The female vagina is an acidic environment with a pH value of only 4 to 5, which is not suitable for the survival of bacteria and is also not suitable for the survival of sperm. Sperm can only survive for 1 to 2 hours in the acidic environment of the vagina, so only strong and active sperm can quickly pass through the cervix, while a large number of sperm with poor ability can only be sacrificed!
Sperm entering the uterine cavity have to face two problems: one is to avoid the merciless devouring of white blood cells in the uterine cavity, and the other is to choose the correct direction of advancement.
In the uterine cavity, sperm can only move forward hard and fast in order to escape being swallowed by white blood cells; after getting rid of the pursuit of white blood cells, sperm must still decide which direction to go. There are two fallopian tubes, left and right. Which one is the right one to go to? At this time, the sperm will usually divide into two groups and move forward in two directions at the same time. The outcome is obvious. One of the steps must be wrong. All the sperm along this route will eventually be absorbed by the fallopian tube. The sperm that have chosen the correct direction are already exhausted when they enter the fallopian tube, and most of them have lost the ability to combine with the egg. They still have to undergo a period of incubation in the female reproductive tract. This incubation process is also called sperm capacitation. The sperm head after capacitation will secrete acrosome enzyme. Only when the sperm is armed with acrosome enzyme can it dissolve the corona radiata and zona pellucida around the egg and truly combine with the egg.
From the hundreds of millions of sperm at the start to the dozens of sperm preparing to sprint to the top after capacitation, the group of sperm that can persist to the end can be regarded as the truly outstanding ones.
Egg really hopes to be united with the champion of this group!
This article is provided by Baidu Reading and is excerpted from \”Pregnancy Can Be Simple\” Author: Feifei Mom