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Each cycle occurs in phases based on events either in the ovary (ovarian cycle) or in the uterus (uterine cycle). The ovarian cycle consists of the follicular phase, ovulation, and the luteal phase; the uterine cycle consists of the menstrual, proliferative and secretory phases. Day one of the menstrual cycle is the first day of the period ...
It seems likely that early menopause occurs for women with low populations at birth, and late menopause occurs for women with high populations at birth, but there is as yet no clinical evidence for this. [4] The process by which primordial cells 'wake up' is known as initial recruitment.
The increase in estrogen and progesterone also lead to increased basal body temperature during the luteal phase. [3] The LH surge that occurs during ovulation triggers the release of the oocyte and its cumulus oophorus from the ovary and into the fallopian tube and triggers the oocyte to divide and enter metaphase of meiosis II (46 or 2n ...
If conception does not occur, decreasing excretion of progesterone will allow the hypothalamus to restart secretion of GnRH. These hormone levels also control the uterine (menstrual) cycle causing the proliferation phase in preparation for ovulation, the secretory phase after ovulation, and menstruation when conception does not occur.
Note that ovulation is characterized by a sharp spike in levels of luteinizing hormone (LH) and follicle-stimulating hormone (FSH), resulting from the peak of estrogen levels during the follicular phase. Ovulation occurs about midway through the menstrual cycle, after the follicular phase. The days in which a woman is most fertile can be ...
At age 45, a woman starting to try to conceive will have no live birth in 50–80 percent of cases. [2] Menopause , or the cessation of menstrual periods , generally occurs in the 40s and 50s and marks the cessation of fertility, although age-related infertility can occur before then. [ 3 ]
For women, menopause is a transition that marks the end of their reproductive years. But the reality is that menopause is preceded by a three to five year transition known as perimenopause.
Labor is separated into 4 stages. The first stage involves latent phase and active phase separated by the dilation of the cervix for 6 to 10 cm. The second stage is the pushing stage. The third stage involves the delivery of the placenta. And the last stage is the contraction of the uterus. [21]