Unit 4 human reproduction noemi sPresentation Transcript
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
.Boys get deeper voices .
Reproductive cells carry out the function of
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 .
-The female reproduction system is made up of :
.The fallopian tubes
-The male reproductive system is made up of :
.The vas deferens
.The seminal vesicles
Pregnancy last about 9 months and ends in
a birth .
During the early stages , different structures
are created to protect the embryo .
. Umbilical cord
. Amniotic sac
The process of giving birth is called labour .
Labour takes place in three phases .