What is the sperm survival rate at 45 years old?

Nowadays, more and more people are marrying and having children later. Many people think that late marriage and late childbearing have a greater impact on women. In fact, it is not. Men should also pay attention to it. Late marriage and late childbearing for men not only affect fertility, but also the quality of fertility. New research has found that men who have children too late have more symptoms in their babies. A study by biologists shows that men also have a limited childbearing age. The sperm density and quality of men over 45 years old are on a downward trend, and the risk of their children suffering from congenital diseases is significantly increased.

After the age of 40, the sperm activity of men will decrease at a rate of 0.7% per year, and sperm deformities will increase. In addition, at the moment of ejaculation, the sperm concentration reaches its highest value.

Changes in sperm density

Sperm density changes with the change of seasons, with the least in summer and the most in winter. Because the "ultra-low temperature environment" is the best space for sperm production, heat will cause a decrease in sperm count. Habits such as placing a laptop on the thighs, taking a sauna or a bath will also cause the male private parts to overheat (over 40 degrees Celsius), causing a significant decrease in sperm count. The situation of high temperature causing a decrease in sperm count can last for several months, so men who are preparing to have children should not take a sauna or bath for a long time.

Sperm structure

Male sperm is frog-shaped, about 66 μm in length, and consists of two parts: head and tail.

The head is oval in shape on the back and pear-shaped on the side. It contains a cytoplasm with a very high chromatin density and an apical body. The apical body is a membrane-bound organelle that covers the front of the cytoplasm in a cap-like shape. The apical body contains a variety of hydrolases such as hyaluronidase, apical enzymes and acid phosphatase, which is equivalent to a very large lysosome.

The center of the tail contains a cochlear filament (similar to a flagellum) that surrounds the entire tail, with a spirally arranged membrane protein in the middle region.

The main function of sperm is forward movement and fertilization with eggs, which is the opportunity to send genetic information into the oocyte. During sexual intercourse, semen is ejaculated into the vagina, and sperm swims out of the seminal plasma, passes through the cervix, uterine body, and the muscle wall of the fallopian tubes on both sides, and finally reaches the abdomen of the fallopian tube to meet the oocyte. The female reproductive system is filled with viscous fluid, and the muscle wall of the fallopian tubes on both sides has uneven wrinkles, which constitutes a great resistance to the transportation of sperm and also plays a role in replacing and selecting sperm. Only sperm with strong exercise ability and appropriate exercise methods can reach the location of the oocyte.