Oestrogen is secreted by-
A. Uterus
B. Graafian follicle
C. Corpus
D. Ovary
Correct Answer: B. Graafian follicle
Explanation
Oestrogen is secreted by:
• Graafian (mature) ovarian follicles — the primary source during the reproductive years.
• Corpus luteum (after ovulation, in smaller amounts).
• Placenta (during pregnancy in large amounts).
• Adrenal cortex (very small amount).
• Fat tissues also convert androgens into estrogen, especially after menopause.
Main answer (most commonly expected in exams):
Graafian follicles of the ovary
Other Options Details:-
Here is the description of all the options:
A. Uterus
• The uterus is a hollow, muscular, pear-shaped organ located in the female pelvis.
• It is the site where a fertilized egg implants and grows during pregnancy.
• It is responsible for menstruation when pregnancy does not occur.
• It has three layers: endometrium (inner), myometrium (middle), and perimetrium (outer).
B. Graafian Follicle
• A Graafian follicle is a mature ovarian follicle found within the ovary.
• It contains a developing ovum (egg).
• During ovulation, this follicle ruptures to release the ovum into the fallopian tube.
• It also produces hormones, mainly estrogen.
C. Corpus
• In the reproductive context, “Corpus” refers to Corpus luteum.
• This is the structure formed from the Graafian follicle after ovulation.
• It secretes progesterone (and some estrogen).
• If pregnancy occurs, it supports early pregnancy; if not, it degenerates.
D. Ovary
• The ovaries are two small almond-shaped organs located on either side of the uterus.
• They produce female gametes (eggs or ova).
• They secrete important hormones: estrogen and progesterone.
• They are essential for ovulation and menstrual cycle regulation.
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Writer: Vandita Singh, Lucknow (GS India Nursing Group)