Biology Activity 2 Implantation and Embryo Development page

Biology Activity 2: Implantation and Embryo Development (page 32)

From Fertilization to Implantation • After fertilization, the zygote starts dividing (multiplying) in the oviduct to form the embryo • The embryo then moves to the uterus to be implanted after about 4 -6 days

Implantation of the Embryo • After the embryo gets implanted in the uterus, it produces a chemical substance that blocks menses • The fertilized egg gets nutrients from its reserves for a week after implantation • Then after that, the nutrients are provided through the placenta and umbilical cord

Placenta and Umbilical cord • The placenta is an organ that develops in the uterus during pregnancy • The placenta is the organ of exchange between the baby and the mother • The umbilical cord connects the baby to the mother through the placenta

Development of the Fetus • During pregnancy, the fetus develops inside a sac filled with liquid. The liquid is called amniotic fluid or amnion • The first organ to develop is the heart. It is followed by the head, arms and legs • From the first month, all organs are already formed

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