Question

What are the primary hormones in girls during puberty?

Answer 1

Follicle stimulating hormone `(FSH)` and Luteinizing hormone `(LH)`.

Explanation:

These hormones are released by anterior pituitary which is quite famous for its primary hormones.

Role of `FSH`:

• Pituitary gland releases `FSH` on he outset of puberty. This hormone simulates he development of several several primary follicles containing thousands of oocytes or immature eggs. {For onset of menarche, about `400,000` follicles are produced} Only one of these follicle continues to grow with its primary oocyte.
  Remaining follicles breakdown by a generative process known as follicle atresia and are converted ino a yellow grandular structure known as Corpus luteum . Corpus luteum secrete progesterone. Progesterone work on endometrium; stimulates formation of placenta and make it receptive for implantation of zygote.
• `FSH` also stimulates ovaries to produce estrogen. Estrogen simulates endometrium and vascularizes it. High levels of estrogen inhibits secretion of `FSH`.

Role of `LH`:

• It causes ovulation i.e release of secondary oocyte(unfertilized egg cell) from ovary.

If fertilizaion takes place then the zygote formed, get implanted in the uterus.
While in other case the corpus luteum starts degenerating which decreases progesterone secretion. Supporting affect of progesterone on endometrium is also reduced which causes breakdown of endometrium. This starts the discharge of cell debris and blood through vagina which is known as menstruation. And the unfertilized egg cell also gets its way outside the body in this process.

Hope it helps...