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Human reproduction and early development
some questions?
Where did you come from?
What were the cells involved in making you?
How did you develop from first cells to birth?
What could have affected your development before
you were born?
Reproduction and development S1
Sperm and Egg cells
Both cells have
a nucleus.
Sperm can swim.
Eggs are much
bigger than sperm.
Reproduction and development S1
Male reproductive system
Sperm duct
Reproduction and development S1
Parts of the male reproductive system
Part
Testes
Sperm duct
Penis
Function
Make sperm
Takes sperm to penis
For depositing semen into vagina
Reproduction and development S1
Female Reproductive system
Reproduction and development S1
Parts of the female reproductive system
Part
Ovary
Fallopian tube
Uterus
Function
Make eggs
Takes eggs to uterus
Where embryo develops
Vagina
Where semen is deposited
Reproduction and development S1
Fertilisation to produce the embryo
Reproduction and development S1
The developing embryo and foetus
Amniotic fluid
Umbilical cord
Amniotic sac
foetus
Reproduction and development S1
The developing embryo and foetus
Structure
Function
Placenta
this allows the exchange of materials between
the mother’s blood and the embryo/foetal
blood
the membrane surrounding the
foetus/embryo
the fluid surrounding the embryo/foetus inside
the sac
the link between the foetus and the placenta.
Amniotic sac
Amniotic fluid
Umbilical cord
Reproduction and development S1
Development of the embryo
Reproduction and development S1
Development of the embryo
The embryo develops from the fertilised egg.
The embryo develops in the uterus (womb).
Development takes approximately 9 months this is
called gestation.
Between 8 and 12 weeks the embryo can be recognised
as human and is called a foetus.
Reproduction and development S1
Development of the embryo
Some of the changes that take place as the embryo
develops are listed below are in the wrong order.
4 – 5 wks
6 – 7 wks
1. Head is more in proportion to the body.
2. Ears, finger nails, toe nails and a
large head are visible.
8 - 9 wks
3. The spinal cord develops.
10 14 wks
4. There is a head end and tail end with
arm and leg bumps.
15 – 22 wks
5. Ear slits and eye bulges are visible
23 – 30 wks
6. Hair is visible and the head is larger
than the shoulders.
Reproduction and development S1
Development of the embryo
Some of the changes that take place as the embryo
develops are listed below now in the right order.
4 – 5 wks
6 – 7 wks
3. The spinal cord develops.
4. There is a head end and tail end with
arm and leg bumps.
8 - 9 wks
5. Ear slits and eye bulges are visible
10 14 wks
2. Ears, finger nails, toe nails and a
large head are visible.
15 – 22 wks
1. Head is more in proportion to the body.
23 – 30 wks
6. Hair is visible and the head is larger
than the shoulders.
Reproduction and development S1
Giving birth
At around 9 months the
baby is ready to be born.
It normally positions itself
head down to get out of
the birth canal more easily.
Labour is the time just
before birth. The
amniotic sac usually
breaks to release the fluid
during this time.
Reproduction and development S1
Giving birth
Natural birth
occurs through
the birth canal.
Midwives and
doctors can
help if there
are problems.
Reproduction and development S1