BIOL 404-Exam 4-Reproduction 15

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kyleannkelsey
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216216
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BIOL 404-Exam 4-Reproduction 15
Updated:
2013-04-28 00:18:25
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BIOL 404 Exam Reproduction 15
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BIOL 404-Exam 4-Reproduction 15
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  1. How long does follicular maturation take to complete?
    3 to four months
  2. The final two stages of follicular development occur when?
    During the first half of the menstrual cycle
  3. What stages of follicular maturation occur during the first half of the menstrual cycle?
    The final two stages (early antral follicle to mature follicle)
  4. What is the corpus albicans?
    The degenerating corpus leuteum that essentially becomes scar tissue
  5. What is the name of the degenerating corpus leuteum?
    Coprus albicans
  6. What are the cells around the ovulate oocyte called?
    The Corona radiata
  7. What time period is the corpus luteum functional?
    day 14-25
  8. What time period does the corpus luteum degrade?
    Days 25-28
  9. Which stage of the ovarian cycle is marked by increasing estrogen levels?
    follicular phase
  10. What stage of the ovarian cycle is marked by increasing progesterone levels?
    The luteal phase
  11. What hormones lead to follicular maturation?
    • Small increases in LH and FSH
    • Which cause an increase in ovarian steroid hormones
  12. What causes ovulation?
    surge in LH
  13. A surge in what hormone marks the change to the leuteal phase of the ovarian cycle?
    LH
  14. A decrease in LH on day 15 leads to what?
    Luteolysis and the reduction of steroid support for a thick endometrium
  15. Inhibin acts on what organ?
    The anterior pituitary
  16. In the female ovarian cycle, What produces negative feedback on the hypothalamus?
    Estrogens
  17. In the female ovarian cycle, what produces feedback to the anterior pituitary?
    Negative feedback from Inhibin (on FSH) and estrogen
  18. What causes dwindling levels of FSH and LH in the luteal stage?
    Inhibin and Estrogens providing negative feedback on the Hypothalamus and Anterior Pituitary
  19. What is the action of Inhibin?
    Decreased FSH secretion
  20. The feedback relationship between ovarian hormones and the hypothalamus/anterior pituitary does what mid-cycle?
    Reverses
  21. The reversal of what causes the large spike in LH mid-cycle?
    The reversal of the feedback loop between the ovarian hormones and the anterior pituitary/hypothalamus
  22. In low plasma concentrations, estrogen causes what?
    • Negative feedback
    • The anterior pituitary to secrete less FSH and LH
    • May inhibit the hypothalamic neurons
  23. When estrogen increases dramatically it causes what?
    • Positive feedback
    • Secretion of More LH, FSH and GnRH
  24. What is the action of high plasma progesterone in the presence of estrogen do to the hypothalamus?
    • Inhibits GnRH secretion
    • Negative feedback

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