2. Primary sexual characteristics
• The reproductive system are the primary
sexual characteristics.We already have
them when we are born and they are
different for male and female.
3. Secondary sexual
characteristics
• The external characteristics which
differentiate men from women are called
secondary sexual characteristics.
• Girls develop breasts and their hips get
wider.
• Boys get deeper voices.
4. Reproductive cells
• Sperm:are the male reproductive cells.They
are small.They have a head and a long tail
called flagellum.They are produced in large
numbers from the time of puberty.
• Ova:are the female reproductive cells.They
do not move.From puberty, an ovum
matures every month.
5. The female reproductive system
• The ovaries produce the ova.
• The uterus is where the baby develops.
• The Fallopian tubes connect the ovaries to
the uterus.
• The vagina connects the uterus to the
outside of the body.
• The vulva is the external part of the female
reproductive system.
7. The male reproductive system
• The testicles are outside the body.
• The vas deferens take sperm from the
testicles to the urethra.
• The urethra takes sperm outside the body.
• The seminal vesicles and prostate
produce seminal fluid and send it t the
urethra.
• The penis is outside the male reproductive
system.
9. Fertilisation
• Fertilisation occurs when an ovum and a
sperm joint 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.
10. Pregnancy
Pregnancy lasts about 9 months and ends
in a birth.
During the early stages, different structures
are created to protect the embryo.
• The placenta:takes nutrients and oxygen
from the mother´s blood to the embryo.
• The umbilical cord:connects the embryo to
the placenta.
• The amniotic sac protects the embryo.
11. Pregnancy
The baby develops step by step:
• After 3 months:the embryo has all its
organs.It becomes a foetus.
• After 5 months:the baby´s body develops
and it starts moving and the mother feels
it.
• After 9 months:the baby is ready to be
born and it weighs around 3 kilos.
13. Labour
The process of giving birth is called
labour.labour takes place in three phases:
• Dilation:rhythmic contractions make the
opening of the vagina and vulva big
enough for the baby to come out.
• Expulsion:the baby is born and the doctor
cuts the umbilical cord.
• Afterbirth:the placenta comes out of the
mother´s body.