PPQ: Describe and explain how a secondary oocyte becomes fertilised.

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  • Once sperm is deposited and responds to the secondary oocytes chemoattractants, they swim through the cervix and uterus towards the oviduct.
  • CAPACITATION occurs next, in which the membrane in front of the acrosome layer of the sperm head becomes more permeable to calcium ions, and becomes more fluid. 
  • This occurs by the removal of glycoproteins and cholesterol. 
  • When sperm reach the secondary oocyte, the acrosome releases proteases which digest the corona radiata.
  • On contact…

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