Obstacles of the female reproductive tract

As we can see in the image, after ejaculation in the vagina, the spermatozoa pass through the cervical canal, the uterine cavity and the fallopian tube. On this long journey they will encounter numerous nooks and crannies or obstacles that will ensure that, of the 250 million sperm that enter the vagina, only a few will reach the egg and only one will be able to fertilize it.

The pH, white blood cells or mucus are some of the barriers that the sperm meet in their first minutes inside the woman's reproductive organ.