The corpus luteum of pregnancy is functionally active up to
A. 10 to 12 weeks
B. 2 to 6 weeks
C. 2 to 4 weeks
D. 6 to 8 weeks
Correct Answer: A. 10 to 12 weeks
Explanation
The corpus luteum of pregnancy is functionally active up to about 10–12 weeks of gestation.
Explanation
- In early pregnancy, the corpus luteum secretes progesterone (and some estrogen), which is essential to:
- Maintain the endometrium
- Support implantation
- Suppress uterine contractions
- Around 10–12 weeks, the placenta becomes fully capable of producing progesterone, so the corpus luteum regresses and is no longer required for hormonal support.
Correct Answer
✔ 10–12 weeks
Other Options Details
Here is the description of all the options in relation to the question:
“Corpus luteum of pregnancy is functionally active up to”
A. 10 to 12 weeks
- This option suggests that the corpus luteum continues to function during early pregnancy up to about 10–12 weeks.
- In normal pregnancy, the placenta becomes fully functional around 10–12 weeks, after which it takes over the production of progesterone from the corpus luteum.
- Clinically, this is the correct duration for which the corpus luteum of pregnancy remains active.
B. 2 to 6 weeks
- This option indicates a shorter period.
- During the first few weeks (2–6 weeks), the corpus luteum is definitely active, but it remains required for longer until placental support develops.
C. 2 to 4 weeks
- This duration is even shorter and does not match physiological reality.
- By 2–4 weeks, pregnancy is only beginning, and the placenta is not yet capable of producing enough hormones on its own.
D. 6 to 8 weeks
- This option is close but still earlier than the full placental takeover.
- Corpus luteum begins to reduce activity around this time, but complete transition occurs closer to 10–12 weeks.
Correct answer:
✔ A. 10 to 12 weeks
Because the corpus luteum of pregnancy is functionally active until the placenta is capable of maintaining progesterone production, which occurs around 10–12 weeks of gestation.
If you want, I can explain:
- The role of corpus luteum in pregnancy
- Difference between corpus luteum of cyclicity vs pregnancy
- Hormonal control by hCG
I hope that you liked this article.
Thanks!! 🙏 😊
Writer: Vandita Singh, Lucknow (GS India Nursing Group)