Corpus luteum develop from
A. Nephrostome
B. None of other option
C. Graafian follicle
D. Oocyte
Correct Answer: C. Graafian follicle
Explanation
Corpus luteum develops from the ruptured Graafian follicle after ovulation.
Explanation
- During the menstrual cycle, a mature Graafian follicle releases an oocyte (ovum) in the process called ovulation.
- After releasing the ovum, the remaining follicular cells (granulosa and theca cells) transform into the corpus luteum under the influence of Luteinizing Hormone (LH).
- The corpus luteum then secretes progesterone (and some estrogen) to maintain the endometrium for possible pregnancy.
So, the correct answer:
✔ Ruptured Graafian follicle
If pregnancy does not occur → corpus luteum becomes corpus albicans.
If pregnancy occurs → becomes corpus luteum of pregnancy.
Other Options Details
Here is the description of all the options:
A. Nephrostome
- A nephrostome is a ciliated funnel-like opening found in some invertebrate animals (e.g., annelids).
- It is part of the excretory system and helps in collecting waste fluid from the coelom into nephridia.
- It plays a role similar to the kidney tubules in higher animals.
B. None of the other option
- This option means no other given choices are correct.
- It is chosen only when all other listed statements/options are incorrect.
C. Graafian Follicle
- A Graafian follicle is a mature ovarian follicle found in the ovary of female mammals.
- It contains a fully developed oocyte (egg) ready for ovulation.
- At ovulation, the follicle ruptures and releases the secondary oocyte into the fallopian tube.
- It also secretes estrogen.
D. Oocyte
- An oocyte is a female germ cell or egg cell precursor.
- It undergoes meiosis to eventually form an ovum.
- Present in the ovarian follicles at different developmental stages: primary oocyte, secondary oocyte, and mature ovum.
- After fertilization, it develops into a zygote.
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Writer: Vandita Singh, Lucknow (GS India Nursing Group)