By the end of the third week, the __________ is formed; it is the first organ to become functional during prenatal development.
A) liver
B) lungs
C) kidney
D) heart
Correct Answer:
Verified
Q15: Michelle, who will be giving birth soon,
Q16: All major internal and external structures form
Q17: The endodermal layer eventually forms
A) the nervous
Q18: The ectodermal cells develop into
A) the heart.
B)
Q19: The mesodermal layer eventually gives rise to
Q21: Which of the following is correct?
A) The
Q22: By the end of the eighth week
Q23: The prenatal support system-the amniotic sac, placenta,
Q24: The embryo grows within the _, a
Q25: One function of the amniotic sac is
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