Fertilization, embryonic development, and birth are the three processes of human reproduction. Fertilization occurs when an ovum and sperm join to form a zygote in the Fallopian tube. Embryonic development lasts approximately nine months and progresses through three trimesters, with the embryo developing organs and moving in the second trimester before growing and maturing until ready for birth in the ninth month.

2. Human reproduction consists of
three processes: fertilisation,
the development of the embryo and
birth.

3. Fertilisation occurs when a spermatozoon and an ovun join together to
create a zygote, a cell which will become a new human being.
The ovum is usually fertilised in the Fallopian tube and it travels
down.

4. The development of the embryo is the period between fertilisation
and birth. It lasts approximatly nine months.
It lasts 3 trimesters:

5. The zygote develops into an embryo ,which travels to the uterus.
The embryo will be protected by. the amniotic sac ,a bag filled
with amniotic fluid.
The placenta is an organ attached to the uterus and joined to the
embryo through the umbilical cord.
The embryo and the mother exchange subtances through the
placenta.

6. In the second trimester:
• 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 of pregnancy, it is able to survive outside
the womb if it is born prematurely.
• In the ninth month the foetus changes downward in preparation
for birth.

8. The walls of the mother´s
vagina and uterus begin to
dilate, the uterus contracts,
The anmiotic sac breaks
The baby and the placenta
leave the mother´s body.
When the baby is born:
the umbilical cord is cut it
leaves a scarf called the
tummy button.

10. 1.What are the three processes of human reproduction?
2.Where is the ovum usually fertilised?
3.How many months does the development of the embryo
last?
4.What is the name of the organ attached to the uterus?

11. 5.How is the embryo called in the second trimester?
6.In the third trimester the embryo …
7.What is the scarf caused by the umbilical cord called?