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Deaf singles, blogs and online chat

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Obstetrics — drughealth A number of abnormalities can affect each of these processes and lead to infertility or pregnancy loss. In most women, spontaneous, cyclical ovulation at to day intervals continues throughout almost 40 years between the time of menarche and menopause. For women who never use contraception, there are approximately opportunities for pregnancy, which may occur with sexual intercourse on any of days the day of ovulation and the 2 preceding days. This narrow window available for fertilization is controlled by tightly regulated production of ovarian steroids that cause the optimal regeneration of endometrium that begins with the ending of menstruation. Should fertilization occur, the events that unfold after the initial implantation of the blastocyst onto the surface of the endometrium through to parturition result from a unique interaction between the trophoblasts of the fetus and the endometrium—decidua of the mother. The ability of mother and fetus to coexist as two distinct immunological systems results from endocrine, paracrine, and immunological modification of fetal and maternal tissues in a manner not seen elsewhere. The placenta mediates a unique fetal—maternal communication system, which creates a hormonal environment that helps initially to maintain pregnancy and eventually initiates the events leading to parturition.