Pregnancy science
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Human reproduction consists of three main processes: fertilization, embryo development, and birth. Fertilization occurs when an ovum and sperm join to form a zygote. The embryo develops inside the amniotic sac over nine months of pregnancy, divided into three trimesters. During this time, the placenta develops to allow exchange between the embryo and mother. When fully developed as a fetus, the baby is ready for birth by the ninth month.
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Pregnancy science
- 2. Human reproduction consists of three processes:
- 3. • Fertilisation occurs when a spermatozoon and an ovum join together to create a ZYGOTE, a cell which will become a human being. • The ovum is usually fertilised in the Fallopian tubes when it travels down.
- 4. • The development of the embryo is the period between the fertilisation and birth. It lasts aproximately nine months. • It is divided into THREE TRIMESTERS.
- 5. • The zygote develops into an embryo. • The embryo will be protected throughout its development inside the AMNIOTIC SAC, a bag filled with a liquid called AMNIOTIC FLUID. • An organ attached to the uterus and joined to the embryo through the umbilical cord called PLACENTA, develops. The embryo and the mother exchange substances through the placenta.
- 6. • The embryo is called a foetus. • Its organs start to develop. The foetus develops a face and moves for the first time.
- 7. • The foetus continues to grow and mature. • In the seventh month it is able to survive outside the womb if it is born prematurely. • In the ninth month the foetus shifts downward; its head is now facing the opening of its mother’s uterus, in preparation for birth.
- 8. • When it is time for the baby to be born, the walls of the mother’s vagina and uterus contracts, the amniotic sac breaks and the baby and the placenta leave the mother’s body. • After the baby is born, the umbilical cord is cut. • The new baby will be fed on his mother’s milk and his nervous system will continue to mature.