Human sperm cells are seen attempting to swim right to left through an artificial stricture in this experiment headed by Alireza Abbaspourrad of Cornell University in New York. Photo: Alireza Abbaspourrad

This is how the female human body uses obstacles to block weak sperm, like salmon running into a waterfall

  • Only the best swimming sperm can make it though tight spots known as strictures that act like gates on the journey from cervix to egg
Topic |   Medicine

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Human sperm cells are seen attempting to swim right to left through an artificial stricture in this experiment headed by Alireza Abbaspourrad of Cornell University in New York. Photo: Alireza Abbaspourrad
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