fertilisation

• Acrosome Reaction 1

  cells surrounding the ovum release chemicals which triggers the acrosome reaction
• Acrosome Reaction 2

  the acrosome swells and fuses with the sperm cell membrane
• Acrosome Reaction 3

  acrosome releases digestive enzymes
• Acrosome Reaction 4

  the enzymes digest the follicles of the zona pellucida
• Cortical Reaction 1

  lysosomes release digestive enzymes via exocytosis
• Cortical reaction 2

  the zona pellucida thickens
• Cortical Reaction 3 


  polyspermy is prevented