Question:
Initially, simple ____ villi develop at the ____ pole of the blastocyst. These villi project into the uterine glands and are responsible for ____ the blastocyst and early ____ nutrition (day 17). Once the chorion and amnion have formed (day ___), the spherical chorionic sac gradually elongates until it forms a ____ with rounded ends (see Fig. 38).
Author: Magdalena BadenhorstAnswer:
Trophoblastic vegetal anchoring histotrophic 21 cylinder
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