1. Foetus Development
D. Crowley, 2007

2. Tuesday, July 09, 2019
Foetus Development
To know what the foetus looks like inside the mother’s uterus

3. Development
What does the foetus need for development? Where does it obtain these?
The foetus relies upon its mother as it develops. It needs: -
Protection
Oxygen
Nutrients (food and water)
It also needs its waste substances being removed

4. Protection
The foetus is protected by the uterus and a protective bag called the amnion
This protective bag (amnion) contains a special liquid - amniotic fluid
It is also vital that the mother take care for her unborn child by having enough nutrients (i.e. eating more for her and baby); be careful what medicines she takes; and be very careful with drugs and drink: as these can be passed into the developing foetus, possibly causing severe problems
For example, a side affect of smoking is that the amount of oxygen transported in the blood is reduced. This can cause the foetus to not get enough oxygen, so it is likely to be born small and premature

5. Needs
Oxygen; nutrients (food and water); and waste products are all taken care of by the placenta
The placenta grows into the wall of the uterus and is joined to the foetus by the umbilical cord
The mother's blood does not mix with the foetus's blood, but the placenta lets substances pass between the two blood supplies: -
oxygen and nutrients diffuse across the placenta from the mother to the foetus
waste substances, such as carbon dioxide, diffuse across the placenta from the foetus to the mother

6. Placenta

7. Embryo Development

8. Developing Foetus
Using the worksheet, cut out the pictures, sticking them in the correct order
Add the labels for the placenta; amnion (fluid filled bag); and developing baby
Then draw an arrow showing the direction oxygen and nutrients travel (from  to) and draw an arrow showing the direction waste products travel (from  to)

9. Amnion (fluid filled bag, containing amniotic fluid)
Developing Foetus
Placenta
Amnion (fluid filled bag, containing amniotic fluid)
Developing foetus
oxygen and nutrients diffuse across the placenta from the mother to the foetus
waste substances, diffuse across the placenta from the foetus to the mother