Human beings reproduce sexually, requiring both a male and female. The document outlines the process of human reproduction from fertilization through birth. It describes how sperm and eggs are produced, how they unite during sexual intercourse to form a zygote, and the development stages of the embryo and fetus as it grows over nine months in the uterus until birth. The male and female reproductive systems and changes during puberty are also explained.

1. REPRODUCTIONREPRODUCTION
UNIT 3
NATURAL SCIENCE
UNIT 3
NATURAL SCIENCE

2. DO YOU KNOW WHERE BABIES REALLY COME FROM?
DO STORKS BRING BABIES IN THEIR BEAKS?

3. HUMAN BEINGS
are living things
THEY PERFORM THREE VITAL FUNCTIONS
INTERACTION REPRODUCTIONNUTRITION
5 senses
Nervous
System
Locomotor
system
Digestive System
Respiratory System
Circulatory System
Excretory System
SEXUAL
2 organisms
are required
(needed):
male and
female
ASEXUAL
1 organism is
required

4. SEXUAL
REPRODUCTION
ASEXUAL
REPRODUCTION

5. Reproduction
It is the third vital function
The process by which living things generate or produce
new living things (offspring/children/descendants) so
they cannot become extinct.
The process by which living things generate or produce
new living things (offspring/children/descendants) so
they cannot become extinct.
Human being performs a sexual reproduction
(a male and a female are required/needed)
Human being performs a sexual reproduction
(a male and a female are required/needed)

6. REPRODUCTION
• What kind of reproduction do human beingsperform?
• What is the meaning ofsperm?
• How do you call the female reproductive cell?
• What happen when sperm andovum meet?
• How doesthe zygote progress/change to?
• How do you call the stage between childhood and adulthood?
• What happen intheadolescence?

7. SPERM (male
reproductive cell)
OVUM
(female
reproductive cell)

9. PREBIRTH
Stages in the human life cycle
baby toddler
child
adult
adolescent
Elderly person
Foetus

10. SEXUAL CHARACTERISTICS: physical diferences
between women and men
PRIMARY SEXUAL
CHARACTERISTICS
SECONDARY SEXUAL
CHARACTERISTICS
They are other physical
differences between men and
women
Wider hips
More body hair
WOMEN MEN
These characteristics appear during puberty
(adolescent)
WOMEN MEN
Facial hair: beard
Adams’s apple
Mature breast
They are the differences between male
and female reproductive organs

11. SECONDARY SEXUAL CHARACTERISTICS
These characteristics appear during PUBERTY (adolescent)

12. OVARIES
Produce female reproductive cells
called OVA. One Ovum matures
each month.
FALLOPIAN TUBES
They connect the ovaries
to the uterus.
UTERUS
It is an organ with muscular
walls. During pregnany a
fertilised cell develops into a
baby in the uterus.
VAGINA
It is a muscular tube which
connects the uterus to the
outside of the body.
VULVA
It covers the opening to the vagina. It’s
outside of the body.
FEMALE REPRODUCTIVE ORGANS

13. MALE REPRODUCTIVE ORGANS
Most male reporductive organs are external and are located on the
outside of the body
TESTICLES
VAS DEFERENS
PROSTATE
URETHRA
PENIS
SCROTUM
They produce and store sperm
This is bag of skin which contains
the testicles. It regulates the
temperature. Testicles need to be
cooler than the rest of the body to
produce sperm.
Sperm travels through two
tubes called vas deferens to the
prostate.
It produces a liquid that form
part of the SEMEN. The semen
is a liquid that carries the
sperm and gives it nutrients
The sperm travels
through the urethra to
the outside of the body
The penis contains the
urethra

14. Secondary sexual characteristic

15. PUBERTY IN GIRLS AND BOYS

16. MENSTRUAL CYCLE?
MENSTRUATION?
HAVE THE PERIOD?
?

17. A menstrual cycle is a process that takes for girls and teens around 28 days.
THE MENSTRUAL CYCLETHE MENSTRUAL CYCLE
If a sperm cell
does not fertilize
the ovum, the
unfertilized egg
will die and the
wall from the
uterus leave the
body.
In other words, a
girl has her
period and the
cycle begins
again.
Menstruation
The blood, tissue from the uterus
and not fertilize ovum leave the
body because it's no longer needed.
It comes from the uterus. And the
girl or woman has her period.
After that, the brain
stimulates the ovum
in the ovaries to grow
and the wall of the
uterus will start
building up in case the
woman becomes
pregnant
Ovulation
About 2 weeks after the last period, another OVUM will be released from one of the ovaries and begins
a trip down one of the fallopian tubes to the uterus.

18. MENSTRUATION
OVULATION

19. MALE REPRODUCTIVE ORGANS
Most male reporductive organs are external and are located on the
outside of the body
TESTICLES
VAS DEFERENS
PROSTATE
URETHRA
PENIS
SCROTUM
They produce and store sperm
This is bag of skin which contains
the testicles. It regulates the
temperature. Testicles need to be
cooler than the rest of the body to
produce sperm.
Sperm travels through two
tubes called vas deferens to the
prostate.
It produces a liquid that form
part of the SEMEN. The semen
is a liquid that carries the
sperm and gives it nutrients
The sperm travels
through the urethra to
the outside of the body
The penis contains the
urethra

20. HOW LONG DOES
PREGNANCY LAST?
HOW LONG DOES
PREGNANCY LAST?
It is the period of time from
conception to childbirth (9 months).
The state of being pregnant.
It is the act of giving birth.
The appearance of a baby from
the body of its mother.
PREGNANCY (noun)
GIVE BIRTH TO... (verb)
CHILDBIRTH (noun)

21. WHAT HAPPEN DURING
PREGNANCY?
WHAT HAPPEN DURING
PREGNANCY?

22. 1ST STAGE: FERTILISATION1ST STAGE: FERTILISATION
The egg (ovum) is released into
the falopian tube (ovulation).
During the sexual act/intercourse
the sperm are deposited in the
woman’s vagina. They use their
tails to reach the OVUM and
ONLY ONE SPERM can fertilise it
(the ovum).
FERTILISATION
That union produces a cell called
ZYGOTE and starts to divide and
multiply.

23. FERTILISATION (fecundación)FERTILISATION (fecundación)

24. 2ndSTAGE:DEVELOPMENTOFTHEEMBRYO2ndSTAGE:DEVELOPMENTOFTHEEMBRYO
After fertilisation, the zygote
travels to the uterus at the
same time it carries on
dividing until it becomes an
EMBRYO.
The embryo
attaches itself
onto the
lining (wall) of
the uterus
where it
continues to
grow.
After the 2nd month the embryo is
about the size of an adult’s THUMB
After the 2nd month the embryo is
about the size of an adult’s THUMB

25. 1ST AND 2ND STAGE1ST AND 2ND STAGE
2ND MONTH OF
PREGNANCY:
embryo
2ND MONTH OF
PREGNANCY:
embryo

26. 3. The
FOETUS
receives
oxygen, food
(nutrients)
from the
mother’s
placenta and
it transfers
waste and
CO2 to the
mother via
placenta.
3RD STAGE:DEVELOPMENTOFTHEFOETUS3RD STAGE:DEVELOPMENTOFTHEFOETUS
1. After the
2th month,
all the organs
are formed
and the
embryo
develops into
a FOETUS
2. The
FOETUS is
floating in a
sac of
amniotic
fluid which
protect it
from impacts
4. The FOETUS is connected
to the placenta by the
umbilical cord

28. The placenta is an organ that connects the developing foetus to the uterine wall.
The placenta provides oxygen and nutrients to growing babies and removes
waste products from the baby's blood. The placenta attaches to the wall of the
uterus, and the baby's umbilical cord develops from the placenta. The umbilical
cord is what connects the mother and the baby.

29. 4th STAGE: BIRTH4th STAGE: BIRTH
PREGNANCY LASTS ABOUT 280
DAYS (9 MONTHS)
DURING
PREGNANCY
JUST BEFORE
THE CHILDBIRTH
•When the foetus is ready to be born, it pushes against the cervix, which
starts to open and widen.
•Babies are usually born head first.
•The umbilical cord comes out with the baby and this is cut and tied and
forms our navel or belly button.
Uterus
Cervix