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A&PPreg & Human Dvlpmt

Across
The placenta secretes these to help maintain pregnancy
After conception, the fertilized cell divides by ___
The umbilical cord contains two of these
At day 22 the fetal heart can do this
The ___ ___ shunts blood around the liver
The zona ___ encases the ovum in a gel-like membrane
Down
The umbilical vein ___ blood to the fetus
The fetus can swallow and "breathe" this fluid
Germ layers form at the beginning of this stage