By Angela Laguipo,
After studying the motion of sperm, a team of researchers from the North Carolina AT&T State University found evidence that sperm cells tend to move closer together when swimming in viscoelastic fluids.
In order for sperm to make it to the egg cell, they must swim inside the vagina and pass through the cervix and uterus until they reach the fallopian tubes, where a sperm will fertilize a waiting egg. This is the case for humans and other mammals.
The fluid inside the reproductive tract is not thin or diluted like water but it has certain levels of viscosity. Some parts of the fluid is viscoelastic, which means it is elastic.
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