The placenta allows diffusion of substances from foetus to the mother. What are these?
a) carbon dioxide excreted by foetus
b) urea excreted by foetus
c) other wastes products
d) all
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The answer is d
The umbilical cord attaches the placenta to the foetus. It contains the umbilical artery and the umbilical vein.
The umbilical artery carries urea and carbon dioxide from the foetus to the mother’s blood.
The umbilical vein carries oxygen and nutrients from the mother’s blood to the foetus.
Maternal blood and foetal blood systems are close together but not joined. They are separated by thin membranes that allow diffusion to occur.
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