Question

Estrogen is secreted by
(1) Corpus luteum
(2) Membranous granulosa of Graafian follicle
(3) Germinal epithelium of ovary
(4) Pituitary

Answer 1

Hint: Estrogen is the female sex hormone. On either side of the uterus, there are two ovaries. The ovaries produce eggs as well as hormones such as oestrogen and progesterone. These hormones aid in the development of females and enable a woman to have a child. During a woman's cycle, her ovaries release an egg.

Complete solution:-
A cortex and a vesicular medulla are visible in a cross slice of the ovary. Round epithelial vesicles, or follicles, are seen in the cortex; follicles are the true focus of ovum formation, or oogenesis. The primary follicle is formed when a layer of granulosa cells surrounds each primary oocyte.
The ovary's follicles are frequently found right beneath the cortex. They produce oestrogen. When they reach adulthood, however, they move to the inner medulla. The medulla is made up of soft stromal tissue layers. A plentiful supply of blood arteries, nerves, and lymph vessels can be found in the stromal tissue.

The correct answer is option B. Membranous granulosa of graafian follicle.

Theca interna and granulosa cells in the Graafian follicle convert cholesterol and create oestrogen. 'Membranous granulosa of the Graafian follicle', is the right answer.

The "dominant follicle" is the one that controls the process, and all others will become atretic. The antral or "dominant" follicles emit oestrogen and inhibin, which have a negative feedback effect on FSH, effectively "shutting off" the antral follicles next to them.

Note:-
These primordial follicles form as a result of two hormones generated by the pituitary gland: follicle stimulating hormone (FSH) and luteinizing hormone (LH). Approximately 20 primordial follicles are stimulated to begin maturation during each ovarian cycle. Follicle ovary is a small, fluid-filled sac in the ovary that contains one immature egg.