Why cannot a woman who is pregnant continue to ovulate?

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Discussion Overview

The discussion revolves around the physiological reasons why a woman who is pregnant cannot continue to ovulate. It explores the roles of hormones such as FSH, LH, and hCG in the context of pregnancy and ovulation, touching on both biological mechanisms and implications for menstrual cycles.

Discussion Character

  • Homework-related
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant notes that FSH matures the egg and LH releases it, suggesting that low levels of these hormones during pregnancy would prevent follicle maturation and ovulation.
  • Another participant references a wiki article indicating that pregnancy keeps LH levels low, implying that this hormonal change is a key factor in halting ovulation.
  • A later reply explains that after fertilization, the blastocyst secretes hCG, which is similar to LH and maintains progesterone production, thus preventing menstruation and further ovulation.
  • It is mentioned that home pregnancy tests detect hCG levels, highlighting its role in early pregnancy detection.

Areas of Agreement / Disagreement

Participants generally agree on the hormonal mechanisms involved in preventing ovulation during pregnancy, but there are nuances in the details of how these hormones interact and their implications, leaving some aspects of the discussion unresolved.

Contextual Notes

There are limitations regarding the depth of hormonal interactions and the specific thresholds of hormone levels that prevent ovulation, which are not fully explored in the discussion.

lioric
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Homework Statement


Why cannot a woman who is pregnant continue to ovulate?

Homework Equations


no equation
FSH matures the egg
LH releases egg

The Attempt at a Solution


I do know that during ovulation fsh matures the egg and Lh releases the egg and after that the remains of the folical which is corpus luteum produces progesterone which helps thicken the lining of the uterus and keep the woman from going into menstruation. And once that dies the placenta produces progesterone to keep the woman from menstruating.
My question is what about LH and FSH?
It should be low right? Because that will keep the follicles from maturing and ovulating
 
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lioric said:
My question is what about LH and FSH?
LH and FSH both spike right around ovulation and then decrease. If an egg is fertilized, the blastocyst begins to secrete human chorionic gonadotropin (hCG) at around day 5 or 6 post-fertilization. This is functionally identical to LH, and thus maintains progesterone production by the corpus luteum which prevents menstruation. And, yes, eventually the corpus luteum degrades and the placenta takes over progesterone production--the trophoblast layer in the blastocyst that secretes hCG eventually becomes the placenta.

Interesting side note: most (all?) home pregnancy tests monitor hCG levels, since it's quite easy to detect even only a few weeks post-fertilization.
 
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