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Scientists discovered that healthy sperm had a reinforced outer layer covering the tail, which gave them the rhythmic force needed to penetrate the mucosal barrier of the cervix of the uterus.
About 15 of the 55 million sperm that have the ability to cross the reproductive system. Cervical mucus is 100 times denser than water, making it one of nature's most challenging challenges .
"We still do not know exactly how this is going, but the ability of sperm to swim can be linked to genetic safety, and cervical mucus is part of the vital process of the woman's body, to ensure that the best sperm reaches the egg, "said Dr. Hermès Gadilla of York University. During the sperm selection process, IVF clinics do not use very viscous liquid to test the best sperm because it was not clear whether this was important or not. "
"Our study indicates that more clinical trials and research are needed to explore the effect of this element on the natural environment when selecting sperm in IVF treatments," he said. -he declares.
The researchers compared the tails of human sperm and other mammals, who practice fertilization in the body, to the sperm of sea urchins, which are fertilized out of the body by releasing sperm into the sea.
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While the sperm tails of the sea urchin and the man share the same inner pulp, the study indicates that sperm tails in mammals may have developed a "reinforced" outer layer, giving them strength and the stability needed to penetrate a thick liquid barrier.
Researchers used virtual models to add and remove whip characteristics in different species, so they could identify their function, and tested the ability of virtual sperm, similar to that of the sea urchin, to swim through a viscous fluid similar to cervical mucus. Under pressure, making it unable to move forward.
"Using virtual sperm, we have been able to understand how to adapt sperm to mammals specifically for swimming with more intense fluids," said Dr. Gadiella. "But without a central nervous system to make decisions on how to move, the team said the source of sperm control is still a scientific mystery.
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