2.  Primary sexual characteristics
.We alredy have them when we are born
and they are different for male and female
- Secondary sexual characteristics
.During puberty , between the ages of
eleven and fifteen , the reproductive
system matures .
Other changes are specific to each sex :
.Girls develop breasts and their hips get
wider
.Boys get deeper voices .

3.  Reproductive cells carry out the function of
reproduction .
 Sperm are the male reproductive cells .
They are small . They have a head and a
long tail called a flagellum . They are
produced in large numbers from the time
of puberty .
 Ova are the female reproductive cells .
They do not move .From puberty , and
ovum matures every month .

4. -The female reproduction system is made up of :
.The ovaries
.The uterus
.The fallopian tubes
.The vagina
.The vulva
-The male reproductive system is made up of :
.The testicles
.The vas deferens
.The urethra
.The seminal vesicles
.The penis

5.  Pregnancy last about 9 months and ends in
a birth .
 During the early stages , different structures
are created to protect the embryo .
. Placenta
. Umbilical cord
. Amniotic sac

6.  The process of giving birth is called labour .
Labour takes place in three phases .
. Dilation
. Expulsion
. Afterbirth