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.

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.