By the time the conceptus arrives in the uterus,
A) it is still a zygote.
B) it is called a trophoblast.
C) it has the three primary germ layers.
D) it shows traces of all the organ systems.
E) it consists of 16 or more cells.
Correct Answer:
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Q25: As it implants,the conceptus is nourished by
Q27: The first body cavity is called the
Q33: In fetal circulation, blood bypasses the lungs
Q37: These are derivatives of ectoderm except
A)the salivary
Q39: This figure shows the placenta and embryonic
Q40: During implantation, the trophoblast divides into a
Q42: Oxygenated blood reaches the fetus through the
Q43: The observation that there is a limit
Q49: Infant respiratory distress syndrome (IRDS)is caused by
Q169: The optimal "window of opportunity" to conceive
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