How do egg cells “know” not to accept more sperm once fertilized? How do they keep the rest out?

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This question is courtesy of my ten year old daughter who meant to search “cornception” on YouTube but got autocorrected to “conception.” The videos that came up were fortunately educational in nature. Thanks for reading this far!

In: Biology

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Anonymous 0 Comments

Once the first sperm cell hits the egg it creates a reaction from the egg to block other sperm. This is an almost instant reaction where the mucus lining gets thicker and creates a “fertilization envelope” that’s basically like a giant barrier that no other sperm can get through.

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