This document summarizes the key stages of human sexual development and reproduction. It describes the primary and secondary sexual characteristics that develop during puberty in males and females. It then explains the main components of the male and female reproductive systems and their functions. Finally, it provides a brief overview of pregnancy, the structures that develop to support the embryo, and the three phases of labor and childbirth.

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