Female reproductive pathways are shaped in a way that rejects weaker sperm, allowing only the fastest candidates through a series of "gates," researchers found at Cornell University. – or "strictures" – while the fastest and most powerful swimmers were able to withstand the flow and break their way through the hole.
"Spermatozoids at speeds higher than the thresholds can pass through the strictures, while the sperm are slower than the thresholds that accumulate under the stricture."
During this process, the strongest swimmers approach the mouth of the structure, while the slower cells remain.
"This hierarchical structure imposes competition between semen, with the most fierce competition between highly mobile microwaves compared to slower sperm," they write.
The team used both human and bullish semen in the tests, both of which gave similar results. , sheds light on what sections of sperm travel are the most difficult to navigate and what causes so many people to fall apart.
"The portal's behavioral structure implies a mobility mechanism that can potentially be used by the female reproductive tract," they explained, which means that more mobile cells ̵