03/04/2026
Fertilisation isn’t simply the “fastest s***m wins.”
Millions of s***m begin the journey, but only a small number reach the egg. Along the way, they must undergo changes (capacitation) to even be capable of fertilising. The egg is surrounded by protective layers, and only s***m with the right molecular compatibility can bind and pe*****te.
Once one s***m successfully fuses with the egg, the egg immediately triggers a reaction that blocks all others from entering (preventing polys***my).
So while s***m compete to reach the egg, fertilisation ultimately depends on highly regulated biological processes where the egg plays an active role in determining which s***m succeeds.