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admin | Diet Pills | 29.12.2015
Gonadotropin-releasing hormone (GnRH) – produced by the hypothalamus (a part of the brain) and stimulates the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) from the pituitary gland.
Follicle-stimulating hormone (FSH) – produced by the pituitary gland and stimulates the growth of follicles in the ovaries, which secrete estrogen. Luteinizing hormone (LH) – produced by the pituitary gland and works with FSH to cause ovulation and later, the release of estrogen and progesterone. Estrogen – hormone secreted by ovarian follicles and the corpus luteum that stimulates thickening of the uterine wall, maturation of an egg, and development of female sex characteristics. Progesterone – hormone secreted by the corpus luteum that stimulates thickening of the uterine wall and formation of mammary ducts. Testosterone – hormone mainly secreted by ovaries and could be secreted also by adrenal glands.
Although testosterone is widely known as the male hormone, it is less well known that it is also a critically important hormone for women. Increased level of testosterone can be responsible for masculinize women, causing them to grow facial and body hair (hirsutism), become overly aggressive, and, in sum, look and behave too much like the stereotypical male. Gonadotropin releasing hormone (GnRH) is secreted from the hypothalamus in a pulsatile manner throughout the menstrual cycle. Luteinizing hormone (LH) is secreted by the anterior pituitary gland and is required for both growth of preovulatory follicles and luteinization and ovulation of the dominant follicle. Estrogen is produced at the level of the ovary and is crucial for the development of the antrum and maturation of the Graafian follicle.

In Belgium the product is sold under the name "Rilatine" and in Brazil and Portugal as "Ritalina". The predominant hormones involved in the menstrual cycle are gonadotropin releasing hormone (GnRH), follicle stimulating hormone (FSH), luteinizing hormone (LH), estrogen, and progesterone. There is a great deal of misunderstanding and confusion about the role that testosterone plays in the physical and emotional health of women.
This causes a chemical reaction in the pituitary gland and stimulates the production of FSH and LH. Progestin levels increase just prior to ovulation and peak five to seven days post-ovulation. GnRH is secreted by the hypothalamus, the gonadotropins FSH and LH are secreted by the anterior pituitary gland, and estrogen and progestin are secreted at the level of the ovary. On average, the frequency of GnRH secretion is once per 90 minutes during the early follicular phase, increases to once per 60-70 minutes, and decreases with increased amplitude during the luteal phase.
The preovulatory LH surge drives the oocyte into the first meiotic division and initiates luteinization of thecal and granulosa cells. Estradiol, the most potent and abundant estrogen, is primarily derived from androgens produced by thecal cells. The first step in progestin synthesis requires p450 enzyme and the two circulating forms of progestin are progesterone and 17-hydroxy-progesterone.
GnRH stimulates the release of LH and FSH from the anterior pituitary, which in turn stimulate release of estrogen and progestin at the level of the ovary.

GnRH induces the release of both FSH and LH; however, LH is much more sensitive to changes in GnRH levels. The androgens migrate from the thecal cells to the granulosa cells, where they are converted into estradiol by aromatase enzyme.
Progestins stimulate the release of proteolytic enzymes from thecal cells that ultimately prepare for ovulation. Progestins further induce migration of blood vessels into the follicle wall and stimulate prostaglandin secretion in follicular tissues. The actions of estradiol include induction of FSH receptors on granulosa cells, proliferation and secretion of follicular thecal cells, induction of LH receptors on granulosa cells, and proliferation of endometrial stromal and epithelial cells.
During the luteal phase, progestins induce swelling and increased secretion of the endometrium.
At low circulating levels, estrogens exert negative feedback on LH and FSH secretion; however, at very high levels estrogens exert positive feedback on LH and FSH secretion. Estrogen further induces proliferation of estrogen-converting granulosa cells and synthesis of estrogen receptors, establishing a positive feedback loop on itself. In the uterine endometrial cycle, estrogen induces proliferation of the endometrial glands.

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