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Menstrual cycle The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that makes pregnancy possible. The ovarian cycle controls the production and release of eggs and the cyclic release of estrogen and progesterone. The uterine cycle governs the preparation and maintenance of the lining of the ...
The luteal phase is characterized by changes to hormone levels, such as an increase in progesterone and estrogen levels, decrease in gonadotropins such as follicle-stimulating hormone (FSH) and luteinizing hormone (LH), changes to the endometrial lining to promote implantation of the fertilized egg, and development of the corpus luteum. In the ...
[1] [2] It is the remains of the ovarian follicle that has released a mature ovum during a previous ovulation. [ 3 ] The corpus luteum is colored as a result of concentrating carotenoids (including lutein ) from the diet and secretes a moderate amount of estrogen that inhibits further release of gonadotropin-releasing hormone (GnRH) and thus ...
Figure 2. Follicular phase diagram of hormones and their origins. Follicle-stimulating hormone (FSH) is secreted by the anterior pituitary gland (Figure 2). FSH secretion begins to rise in the last few days of the previous menstrual cycle, [3] and is the highest and most important during the first week of the follicular phase [4] (Figure 1).
Diagram illustrating how the uterus lining builds up and breaks down during the menstrual cycle Menstruation (also known as a period, among other colloquial terms) is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. The menstrual cycle is characterized by the rise and fall of hormones. Menstruation is triggered by falling progesterone ...
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Approximately 1–2% of ovulations release more than one oocyte. This tendency increases with maternal age. Fertilization of two different oocytes by two different spermatozoa results in fraternal twins. [10] The precise moment of ovulation was captured on film for the first time in 2008, coincidentally, during a routine hysterectomy procedure.
Hormonal therapies to reduce or stop menstrual bleeding have long been used to manage a number of gynecologic conditions including menstrual cramps (dysmenorrhea), heavy menstrual bleeding, irregular or other abnormal uterine bleeding, menstrual-related mood changes (premenstrual syndrome or premenstrual dysphoric disorder), and pelvic pain due to endometriosis or uterine fibroids.