Sexual reproduction allows human beings to have children. During puberty, males and females develop primary and secondary sex characteristics that distinguish their reproductive organs and bodies. Females produce eggs in their ovaries monthly while males continuously produce sperm in their testicles. Fertilization occurs when sperm fertilizes an egg during sexual intercourse, forming a zygote that develops into an embryo and fetus over nine months of pregnancy, ending with childbirth.

2. Sexual reproduction is how human beings have children.
SEX CHARACTERISTICS
There are physical difference between male and female bodies.
These differences are called sex characterstics.
There are two types of sex characteristics.
•Primary sex characteristics: are physical differences between male and female
reproducive organs.
•Secondary sex characteristics: men have got more facial hair and woman wider hips, this
apparing during the puberty.
The human body prepares itself for the reproductive process during a period of live called
puberty.
A girls breasts Her body gets rounder and her Body hair also grow under hips arms
get larger. hips get wider. and in her pubic area.
A boy´s His muscles get Body hair grows
voice get larger and his under his arms, on
deeper. shoulder get his chest, in his pubic
wider. area and in his face.

3. There are two types of human reproductive
cells: the female egg cell (ovum)and the male
sperm cell ( spermatozoon). Both types of
reproductive cells are also called gametes.
•The female reproductive system produces
egg cells in the ovaries.
During puberty , a girl´s body starts to
produce egg cell every 28 days. This process
usually stop at 45 and 55 years old.
•The male reproductive system produces
sperm cell in the testicles.
During puberty , a boy´s body starts to
produce sperm cell, produce millions of sperm
EGG CELL. SPERM CELL cells all the time.

4. The female reproductive system is formed by internal (or genital) and
external sex organs.
The external female sex organs are called vulva:
•The labia majora and labia minora protect the rest of the vulva .
•The vaginal orifice.
•The clitoris.
the internal female sex organs:
The fallopian tubes
carry egg cells from the
Are two almond ovaris to the uterus.
shaped organs
that produce
egg cell.
Uterus is a hollow
organs whit
The vagina is a
muscular walls.
muscular canal that
leads from the
vulva to the uterus

5. •The ovarian cycle, an egg cell start to mature inside one of the ovaries .
On the 14 day of the ovarian cycle , the egg cell leaves the uterus .this is
called ovulation.
•The uterine cycle , the walls of the uterus beacome thicker of extra
tissue and blood. This change prepare the uterus for a fertilised an egg
cell.This is called menstruation.

6. The male reproductive system produces sperm cells. It also transports the
sperm cells out of a man´s body and into a woman´s reproductive system.
The penis, which deposits sperm cells in the vagina.
The testicles, which produce millions of sperm cells.
The vas deferens, which carries these sperm cells to the urethra.
The seminal vesicles and the prostate, which produce liquids to make semen;
the semen is a liquid which contains nutrients to keep the sperm cells alive.
The urethra, which carries the semen and the sperm cells out of the body.
6.Sperm cells grow and mature inside the testicles.
7.Each vas deferens transports cells to of the seminal vesicles.
8.The prostate and into the urethra, along with semen.
9.Finally, the semen and the sperm cells travel, out the end of the penis. This
process is called ejaculation.

7. When a sperm cell fertilises an egg cell, and join to form a new cell called a
zygote. When the zygote develops is called fetus.
To fertilise an egg cell, a man and a woman have sexual intercourse.
During intercourse, the man puts his penis into the woman´s vagina and
deposits his semen, which contains millions of sperm cells.
The sperm cells swim into the uterus and up the fallopian tubes. If there
is a egg cell in the fallopian tube, only one sperm cell can fertilise it.
When this happens, the sperm cell and the egg cell combine and form
one new cell, called a zygote.
After fertilization, the zygote divides many times to form a group of cells
this is called an embryo. After about six days, the embryo joins itself to
the wall of the uterus.

8. Pregnancy is the time between the fertilization of an egg cell and the
birth of a baby.
Pregnancy last for about nine months. During this me, two special
organs form inside the uterus: the placenta and the amniotic sac.
The fetus is connected to the The amniotic sac is a thin bag
placenta by the umbilical. of tissue that contains a liquid
The placenta provides the called amniotic fluid. This
fetus with oxygen and liquid supports the fetus and
nutrients from the mother´s protects it from impacts and
blood. The placenta also vibrations.
takes away carbon dioxide
and waste that the fetus
produces.

9. Birth is when the baby leaves the uterus through the vagina. Birth happens in
three stages, the dilation of the cervix, the expulsion of the baby and the
expulsion of the afterbirth.
1
First, the walls of the uterus start to
contract in a rhythmic way and the 2
cervix dilates.
Next, the baby is expelled through
the vagina. After that, the baby
starts to breathe. The doctor also
knots and cuts the umbilical cord.
3
Finally, the uterus contracts again
and the afterbirth is expelled.

10. David Palazón