BI-2187
Fertilisation and early development
Biology · Secondary 4 · Medium · Fertilisation and early development
A placenta allows some substances to pass between the mother’s blood and the fetus’s blood. Which statement correctly describes how the placenta acts like a lung?
- It allows oxygen to diffuse into the fetal blood and carbon dioxide to diffuse out.
- It filters urea from the fetal blood into the mother’s blood.
- It produces antibodies that protect the fetus from infection.
- It secretes digestive enzymes into the fetal digestive system.
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