Estrogen menstrual cycle

Testosterone promotes muscle growth deepening of the voice the growth of body hair and other male secondary sex characteristics Testosterone is formed from cholesterol and IS the biosynthetic precursor of estradiol the principal female sex hormone or estrogen Estradiol is a key substance m the regulation of the menstrual cycle and the reproductive process It is the hormone most responsible for the development of female secondary sex characteristics... 

Women who have been in contact with toxafene have an increased estrogen level in the initial period of the menstrual cycle. Moreover, there was no clear phase change, which shows that hormonal regulation was disrupted [15]. The negative impact of even low doses of OCPs on pregnancy has been proved, especially in the third trimester [1]. It has been shown many times that there is a correlation between embryo death and pesticide content in the mother s body [1]. We will now quote several results of the study of pesticides effects on pregnancy and birth. 

Baker VL, Draper M, Paul S, Allerheiligen S, Giant M, Shifren J, Jaffe RB (1998) Reproductive endocrine and endometrial effects of raloxifene hydrochloride, a selective estrogen receptor modulator, in women with regular menstrual cycles. J Clin Endocrinol Metab 83 6-13... 

Estradiol is the most important of the estrogens. Like progesterone, it is synthesized by the ovaries and, during pregnancy, by the placenta as well. Estradiol controls the menstrual cycle, it promotes proliferation of the uterine mucosa, and is also responsible for the development of the female secondary sexual characteristics (breast, fat distribution, etc.). 

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