What are the germ layers, and from what do they arise?
A) The germ layers are an inner cell mass that flattens to form the embryonic disc.
B) The germ layers are an inner cell mass that separates from the trophoblast to create the amniotic cavity.
C) The germ layers are shoots sent out by the trophoblast to gain nourishment from the endometrium.
D) The germ layers are three layers that arise from the embryonic disc and produce all the organs and tissues of the body.
Correct Answer:
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Q1: Which portion of the blastocyst fuses with
Q2: Blood returns to the fetus from the
Q4: When does the fetal heart begin to
Q5: How many chromosomes does a zygote have?
A)
Q6: What is the name of the blackberry-like
Q7: The stage of development that begins at
Q8: Implantation typically occurs approximately
A) 3 days after
Q9: What role is served by the ductus
Q10: Most of the organs are developed during
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