Why do the maternal and fetal blood supplies remain separate at the placenta?

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Question

Why do the maternal and fetal blood supplies remain separate at the placenta?

Accepted Answer

Because their blood groups may differ and maternal blood pressure would damage fetal vessels — Award 1 mark. Exchange occurs by diffusion across the thin barrier between them.

Answer

Because the placenta produces no blood vessels

Answer

Because fetal blood contains no haemoglobin

Answer

Because their blood groups may differ and maternal blood pressure would damage fetal vessels

Answer

Because fetal blood is at a much lower temperature

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