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Home Q & A Board Biology-Related Homework Help Medicine Pharmacology (Moderator: DelightfulMind)
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Siisi Siisi
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6 years ago
What is the mechanism whereby estrogen functions as a contraceptive?
 
  a. Inhibiting luteinizing hormone (LH), blocking release of ovum from a follicle
  b. Thinning cervical mucus, which inhibits sperm migration
  c. Trapping the ovum in the endometrial wall, preventing its growth
  d. Blocking follicle-stimulating hormone (FSH), thereby preventing release of ovum
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#1
6 years ago
ANS: D
Estrogens block pituitary release of FSH, preventing the ovaries from developing a follicle from which the ovum is released. Progestins inhibit pituitary release of LH, the hormone responsible for releasing an ovum from a follicle. Estrogens and progestins alter cervical mucus by making it thick and viscous, inhibiting sperm migration. Hormones also change the endometrial wall, impairing implantation of the fertilized ovum.
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