BIOL 404-Exam 4-Reproduction 19

  1. After conception, when progesterone levels increase substantially and the fallopian tube relaxes, what occurs?
    The Morula is delivered to the Uterus
  2. What controls the speed of delivery of the morula to the uterus?
    Estrogen 2, controls the cilia of the fallopian tube
  3. If the the cilia beat too slowly, what occurs?
    Tubal pregnancy
  4. If the cilia beat too fast, what occurs?
    The endometrium is unprepared for implantation
  5. What changes occur for the morula to become the blastocyst?
    morula secretes fluid into the cavity
  6. What part of the bastocyst becomes the embryo?
    inner cell mass
  7. The inner cell mass of the bastocyst becomes what?
    The embryo
  8. What part of the blastocyst will become the placenta/chorion?
    The outer layer of trophoblast cells
  9. What part of the blastocyst is the trophoblast?
    The outer layer
  10. What will the trophoblast of the blastocyst become?
    The placenta/chorion
  11. When the blastocyst reaches the uterus, what happens?
    It floats freely for 2-3 days
  12. When does the Zona pellucida disintegrate?
    After reaching the uterus, via uterine fluids
  13. What mediates the disintegration of the Zona Pellucida?
    Uterine fluids
  14. How long after implantation does HCG production begin?
    6-7 days
  15. What occurs 6-7 days after fertilization?
    HCG production
  16. How long after conception is pregnancy measurable?
    6-7 days
  17. How many days after the LH peak does ovulation occur?
  18. How many days after the LH peak foes reftilization occur?
  19. How many days after the LH peak does the zygote have ~32 cells?
    2-4 days
  20. How many days after the LH peak does the blastocyst arrive in the uterus?
    5 days
  21. How many days after the LH peak does implantation occur?
    6-7 days
  22. How many days after the LH peak does HCG production occur?
    9-10 days
  23. What is the purpose of HCG release?
    To rescue the corpus luteum from disintegration
  24. What rescues the corpus luteum from disintegration?
    HCG production
  25. What major occurrences happen after the first trimester?
    • Nutritive/exchange is fully in place
    • Maternal and fetal circulations complete
    • Hormonal support
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BIOL 404-Exam 4-Reproduction 19
BIOL 404-Exam 4-Reproduction 19