The placenta acts as a medium for the passage of nutrients from the mother to the embryo. It also functions as a barrier preventing the mixing of fetal and maternal bloodstreams. The amniotic fluid is contained within the amniotic sac, which surrounds the embryo and serves as a cushion against external pressure. The fine, downy hair that covers the fetus in the womb is called lanugo.

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The Placenta

Question 26

Multiple Choice

The placenta:

A) allows fetal and maternal bloodstreams to mix.
B) contains amniotic fluid.
C) acts as a medium for the passage of nutrients from the mother to the embryo.
D) is the fine, downy hair that covers the fetus in the womb.

Correct Answer: