The document summarizes human reproduction and development. It explains that reproduction occurs through sexual reproduction which brings together male and female sex cells. During puberty, the reproductive systems mature and secondary sex characteristics develop like breasts or facial hair. The male reproductive system includes testes that produce sperm and the female system includes ovaries that produce eggs. Fertilization occurs when an egg and sperm join to form a zygote. Pregnancy lasts around 9 months as the embryo develops into a fetus and baby. Childbirth occurs in three stages of dilation, expulsion, and delivery of the afterbirth.

2. Reproduction
Living things create other living things in the
process of reproduction. Human beings
reproduce
through
sexual
reproduction, bringing male and female sex cells
together.

3. Primary sexual
characteristics
The reproductive systems are the primary
sexual characteristics. We already have them
when we are born and different for male and
female.

4. Secondary sexual
characteristics
The external characteristics which differentiate men from
women are called secondary sexual characteristic
During puberty, between the ages of eleven and
fifteen, the reproductive system matures. Some physical
changes are the same for both sexes, like growing taller
or hair growing in the armpit.
Other changes are specifics to each sex:
 Girls develop breasts and their hips get wider.
 Boys get deeper voices.

6. Reproductive Cells
Sperm
Ova
Sperm
are
the
male
reproductive cells. They are
small. They have a head and a
long tail called flagellum. They
are produced in large numbers
form the time of puberty.
Ova
are
the
female
reproductive cells. They do not
move. From puberty, an ovum
maturates every month.

7. The Reproductive System:
The female reproductive system
The female reproductive system is made up of
these organs:
 The ovaries produce the ova.
 The uterus is where the baby develops.
 The fallopian tubes connect the ovaries to the
uterus.
 The vagina connects the uterus to the outside of
the body.
 The vulva is the external part of the female
reproductive system.

9. The Reproductive System:
The male reproductive system
The male reproductive system is made up of these
organs:
 The testicles are outside the body. They produce
sperm. They are covered by a bag of skin called the
scrotum.
 The vas deferens take sperm from the testicles to the
urethra.
 The urethra takes the sperm outside the body.
 The seminal vesicles and prostate produce seminal
fluid and send it to the urethra.
 The penis is outside the male reproductive system.

11. Fertilisation
Fertilisation occurs when an ovum and a sperm
join inside the fallopian tubes and they create a
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.

12. Pregnancy And Birth:
Pregnancy
Pregnancy lasts about 9 moths and ends in a birth.
During the early stages, different structures are created
to protect the embryo.
 The placenta takes nutrients and oxygen from the mother´s blood
to the embryo.
 The umbilical cord connects the embryo to the placenta.
 The amniotic sac protects the embryo.

13. Pregnancy And Birth:
Pregnancy
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 stars
moving and the mother feels it.
 After 9 months: the baby is ready to be born and
weighs around 3 kilos.

14. Pregnancy And Birth: 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 doctor outs umbilical
cord.
 Afterbirth: the placenta comes out of the mother´s body.

15. For: Lucía Bueno and Yael Barcenilla