Fertilisation

• Fertilisation


  The sperm and the egg join together to create a zygote
• Zygote development


  1. Zygote makes copies of itself

  2. After eight cells have been created, an embryo is formed
• Embryo development


  1. Embryo moves down into the uterus

  2. Embryo attaches itself to the blood-rich lining of the uterus
• Placenta


  • A large organ that the embryo becomes attached to by the umbilical cord
  • Allows substances the baby needs to survive, including nutrients and oxygen, to pass from the mother's bloodstream into the baby's bloodstream
  • Allows waste like carbon dioxide to pass from the baby's bloodstream into the mother's bloodstream, which the mother then removes
• Fetus


  The name given to the embryo after 9 weeks of development
• Amniotic sac


  • A fluid-filled sac that surrounds the fetus
  • Protects the baby from bumps
• The watery liquid in the amniotic sac is called amniotic fluid