helth fertilization project

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  • during an intercorse millions of sperm  enter the vaginia. 
  • then they go throught the cervex wich is ussaly closed, but is open when a women ovulates
  • then, when the sperm enter the uterus, many die from white blood cells. half the survivors head for the empty fallopian tube and a half for the one with the egg. 
  • as the sperm swim up the falopiam tube, they swim aganst silia,wich are trying to push the egg twards the uterus. a change happens in the heads of the sperm wich make them move faster. many will get traped in the silia and die.
  • then the few remaining sperm have to push past the eggś corona radiata cells and get to the zona pousada. the heads of the sperm react to this layer and release digestive emzymes.
  • then one sperm meets the egg and the genetic material mixes, and a new person is started.
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