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Paper 4Theory (Extended)3 marks
The placenta and umbilical cord play crucial roles in fetal development by facilitating the exchange of substances between mother and fetus.
Diagram Description
Diagram of Placenta and Umbilical Cord
A diagram shows the placenta attached to the uterine wall with the umbilical cord connecting the fetus to the placenta. Arrows indicate the movement of oxygen and nutrients from mother to fetus and waste products from fetus to mother.
| Substance | Direction of Transfer |
|---|---|
| Oxygen | Mother to fetus |
| Nutrients | Mother to fetus |
| Carbon dioxide | Fetus to mother |
| Waste products | Fetus to mother |
- a[3]
Describe how the placenta and umbilical cord function in the transfer of substances between the mother and fetus.
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