3. SECONDARY SEXUAL
CHARACTERISTICS
The external characteristics which
differentiate men from woman are called
secondary sexual characteristics.
During puberty , between the ages of eleven
and fifteen , the reproductive systems
matures .
Other changes are specific to each sex :
*Girls develop breasts and their hips get wider.
*Boys get deeper voices.
4. REPRODUCTIVE CELLS
Reproductive cells carry out the funtion of
reproduction
*Sperm are the male reproductive cells.They are
small.They have head and a long tail called a
flagellum.They are produced in large numbers
from the time of the puberty.
*Ova are the female reproductive cells.They do not
move.From puberty,an ovum matures every
month.
5. THE REPRODUCTIVE SYSTEM
The female
reproductive system
-The ovaries
-The uterus
-The fallopian tubes
-The vagina
-The vulva
6. THE REPRODUCTIVE SYSTEMS
The male reproductive
system:
-The testicles
-The vas deferens
-The urethra
-The seminal vesicles and
prostate
-The penis
7. FERTILISATION
Fertilisation occurs
when an ovum and a
sperm join inside the
fallopian tubes and they
create 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.
8. PREGNANCY AND BIRTH
Pregnancy lasts about 9 months and ends in a
birth.
During the early stages, different structures
are created to protect the embryo.
*The placenta
*The umbilical cord
*The amniotic sac
9. AFTER...
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.
10. 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 doctors
cut the umbilical cord.
*AFTERBIRTH : the placenta comes out of the
mother’s body.
