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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 ...
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 ...
For young women in many cultures, the first menstruation is a marker that signifies a change in status. Post-menarche, the young woman enters a stage called maidenhood, the stage between menarche and marriage. [41] There are cultures that have in past centuries, and in present, practiced rites of passage for a girl experiencing menarche. [42]
Even if a woman doesn’t have immediate health concerns and isn’t worried about getting pregnant, monitoring periods can help establish a baseline that may be useful later.
Many countries have various legal regulations in place to protect pregnant women and their children. Many countries have laws against pregnancy discrimination. [174] Maternity Protection Convention ensures that pregnant women are exempt from activities such as night shifts or carrying heavy stocks.
Rats are polyestrous animals that typically have rapid cycle lengths of 4 to 5 days. [22] Although they ovulate spontaneously, they do not develop a fully functioning corpus luteum unless they receive coital stimulation. Fertile mating leads to pregnancy in this way, but infertile mating leads to a state of pseudopregnancy lasting about 10 days.
As a paracrine hormone, relaxin helps the non-pregnant uterus become ready for pregnancy. [23] Women's endometrium contains relaxin, which is an essential component that helps prepare the body for early pregnancy. [21] The endometrium is transformed into decidua during the early pregnancy maintenance procedure. [21]
The normal period of gestation (pregnancy) is about nine months or 36 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus. The germinal stage takes around 10 days. [1] During this stage, the zygote divides in a process called cleavage.
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