Placental exchangeHardQuestion 9196
Question
Which statement is correct about maternal and foetal blood in placenta?
- AThey come close for exchange but do not normally mix directlyCorrect
- BThey always mix completely in healthy placenta
- CFoetal blood stays only in uterus wall
- DMaternal blood flows through amnion
Correct answer
They come close for exchange but do not normally mix directly
Explanation
Exchange occurs across placental membranes while maternal and foetal blood usually remain separate.