What is human chorionic gonadotropin, and what does it do?
A) It is a hormone secreted by the trophoblast; it prompts the corpus luteum to secrete estrogen and progesterone.
B) It is an enzyme secreted by the trophoblast to aid implantation.
C) It is a hormone secreted by the corpus luteum to inhibit ovulation.
D) It is a hormone secreted by the placenta to help maintain the uterine lining.
Correct Answer:
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Q10: Most of the organs are developed during
Q11: If the ductus arteriosus fails to close
Q12: The umbilical cord contains
A) two umbilical arteries
Q13: Gestation typically lasts about
A) 40 weeks.
B) 42
Q14: Which extraembryonic membrane serves as the foundation
Q16: What key developmental task initiates the beginning
Q17: Which statement about the amnion is accurate?
A)
Q18: Which of the following statements about the
Q19: Which extraembryonic membrane eventually forms the fetal
Q20: The mesoderm gives rise to
A) cardiac muscle.
B)
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