Unit 4 human reproduction claudia lucia and teresa s
By Teresa,Claudia and
The reproductive system are the
primary sexsual characteristics.
We alredy have them when we are
born and they are different for male
The external characteristics which
differentiate men from women are
called secondary sexual
During puberty between the ages of
eleven and fifteen the reproductive
system matures.Some physical
changes are the same for both sexes,
like growing taller or hair growing in
Other changes are specific to each sex:
Girls develop breasts and their hips
Boys get deeper voices or get facial
Reproductive cells carry out the funtion
Sperm: are the male reproductive
cells. They have a head and a long tail
called flagellum. They are produced in
large numbers from the time of
Ova: are the female reproductive cells.
They do not move. From puberty an
ovum matures every month.
THE REPRODUCTIVE SYSTEMS .
THE FEMALE REPRODUCTIVE
MALE REPRODUCTIVE SYSTEM
Fertilisation occurs when an ovum and a sperm
join inside the fallopian tubes and they create a
single cell called zygote. The zygote goes down
the fallopian tubes, it is implanted in the wall of
the uterus and it becomes an embryo.
PREGNANCY AND BIRTH
Pregnancy last about 9 months and
ends in a birth.
During the early stages, different
structures are created to protect the
The umbilical cord.
The amniotic sac.
The baby develops step by step:
After 3 months: the embryo has all its
organs. It becomes a foetus.
After 5 months: the baby starts moving
and the mother feels it.
After 9 months: the baby is ready to be
born and it weighs around 3 kilos.