S&period

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S&period

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Period definition, a rather large interval of time that is meaningful in the life of a person, in history, etc., because of its particular characteristics: a period of illness; a period of great profitability for a company; a period of social unrest in Germany. Menstruation, also known as a period or monthly, is the regular discharge of blood and mucosal tissue (known as menses) from the inner lining of the uterus through the vagina. A period is a release of blood from a girl's uterus, out through her vagina. It is a sign that she is getting close to the end of puberty. There is a lot to learn about periods. Here are some common questions that teens have. When Do Most Girls Get Their Period? Most girls get their first period. January 04, - GMT Emmy Griffiths Do you need something else to watch after storming through Bridgerton? Check out our favourite, slightly risque period dramas to sink your teeth into. 'Bridgerton' star of the Shonda Rhimes' critically adored series explains what it was like making this sexy series. Plus a conversation about what it's like.
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Further information: List of archaeological periods. Further information: Universal history. Further information: History of the Americas and History of the United States.

Further information: History of Southeast Asia. Further information: History of the Philippines. Further information: History of China.

Further information: History of Mongolia. Further information: History of Egypt. Further information: History of Europe.

Further information: History of India. Further information: History of Japan. Further information: History of the Middle East and History of Mesopotamia.

Main articles: Geologic time scale and List of Global Boundary Stratotype Sections and Points. Main article: Timeline of the Big Bang.

Study of the Ancient universe Papers, BBC News. Retrieved January 3, The New York Times. I'm reading about the age of Thomas Jefferson.

We live in the computer age. Please tell us where you read or heard it including the quote, if possible. Test Your Vocabulary Name that Thing: Toys and Games Edition Name that thing: Chinese checkers pente reversi go Can you spell these 10 commonly misspelled words?

Test Your Knowledge - and learn some interesting things along the way. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

A tale of two variants Ask the Editors 'All Intensive Purposes' or 'All Intents and Purposes'? We're intent on clearing it up 'Nip it in the butt' or 'Nip it in the bud'?

We're gonna stop you right there Literally How to use a word that literally drives some pe Is Singular 'They' a Better Choice? The awkward case of 'his or her' Word Games Name that Thing: Toys and Games Edition It's all fun and games until someone beats your h He's making a quiz, and checking it twice Can you spell these 10 commonly misspelled words?

Build a chain of words by adding one letter at a Login or Register. GAMES BROWSE THESAURUS WORD OF THE DAY WORDS AT PLAY SETTINGS. Mice have been used as an experimental system to investigate possible mechanisms by which levels of sex steroid hormones might regulate nervous system function.

During the part of the mouse estrous cycle when progesterone is highest, the level of nerve-cell GABA receptor subtype delta was high.

Since these GABA receptors are inhibitory , nerve cells with more delta receptors are less likely to fire than cells with lower numbers of delta receptors.

During the part of the mouse estrous cycle when estrogen levels are higher than progesterone levels, the number of delta receptors decrease, increasing nerve cell activity, in turn increasing anxiety and seizure susceptibility.

Estrogen levels may affect thyroid behavior. Among women living closely together, it was once thought that the onsets of menstruation tend to synchronize.

This effect was first described in , and possibly explained by the action of pheromones in Research indicates that women have a significantly higher likelihood of anterior cruciate ligament injuries in the pre-ovulatory stage, than post-ovulatory stage.

The most fertile period the time with the highest likelihood of pregnancy resulting from sexual intercourse covers the time from some 6 days before until 2 days after ovulation.

A variety of methods have been developed to help individual women estimate the relatively fertile and the relatively infertile days in the cycle; these systems are called fertility awareness.

There are many fertility testing and fertility awareness methods, including urine test kits that detect hormones in urine, basal body temperature, cervical fluid consistency, or cervix position.

Fertility awareness methods that rely on cycle length records alone are called calendar-based methods. Changes in hormone levels along the cycle trigger other changes such as temperature or cervical fluid consistency.

Most hormonal methods rely on LH , FSH or estrogen. LH tests can be used to detect an LH peak or an LH surge that occurs 34—36 hours [11] before ovulation, these tests are known as ovulation predictor kits OPKs.

FSH and LH levels in correlation are sometimes an indicator of fertility or menopause. Computerized devices that interpret basal body temperatures, urinary test results, or other physiological changes are called fertility monitors.

A woman's fertility is also affected by her age. However, despite this hypothesis, a similar paternal age effect has also been observed. As measured on women undergoing in vitro fertilization , a longer menstrual cycle length is associated with higher pregnancy and delivery rates, even after age adjustment.

Many women experience painful cramps, also known as dysmenorrhea , during menstruation. The different phases of the menstrual cycle can correlate with women's moods.

In some cases, hormones released during the menstrual cycle can cause behavioral changes in females; mild to severe mood changes can occur. The natural shift of hormone levels during the different phases of the menstrual cycle has been studied in conjunction with test scores.

When completing empathy exercises, women in the follicular stage of their menstrual cycle performed better than women in their midluteal phase. A significant correlation between progesterone levels and the ability to accurately recognize emotion was found.

Performances on emotion recognition tasks were better when women had lower progesterone levels. Women in the follicular stage showed higher emotion recognition accuracy than their midluteal phase counterparts.

Women were found to react more to negative stimuli when in midluteal stage over the women in the follicular stage, perhaps indicating more reactivity to social stress during that menstrual cycle phase.

Fear response in women during two different points in the menstrual cycle has been examined. When estrogen is highest in the preovulatory stage , women are significantly better at identifying expressions of fear than women who were menstruating, which is when estrogen levels are lowest.

The women were equally able to identify happy faces, demonstrating that the fear response was a more powerful response.

To summarize, menstrual cycle phase and the estrogen levels correlates with women's fear processing. However, the examination of daily moods in women with measuring ovarian hormones may indicate a less powerful connection.

In comparison to levels of stress or physical health, the ovarian hormones had less of an impact on overall mood. Sexual feelings and behaviors change during the menstrual cycle.

Before and during ovulation, high levels of estrogen and androgens result in women having a relatively increased interest in sexual activity.

Behavior towards potential mating partners changes during different phases of the menstrual cycle. During the fertile phase, some women may experience more attraction, fantasies and sexual interest for extra pair men and less for the primary partner.

Preferences for voice pitch change across the cycle. Women's preference for male's body odor is hypothesized to change across the menstrual cycle. Additionally, during their most fertile phase of the menstrual cycle, women may show preference for the odor of symmetrical men.

With regard to women's smell across the cycle, some evidence indicates that men use olfactory cues in order to know if a woman is ovulating.

Findings on the role of scent and chemical communication on human behavior are controversial. While many studies do report a role, the effects are often subtle and invariably rely on small sample sizes resulting in questionable reproducibility.

Preferences for facial features in mates can also change across the cycle. Preferences for body features can change during the fertile phase of the cycle.

Women seeking a short-term partner demonstrate a preference for taller and muscular males. In short term mates, during the fertile phase, women may show more attraction to dominant men who display social presence.

Females have been found to experience different eating habits at different stages of their menstrual cycle, with food intake being higher during the luteal phase than the follicular phase.

Various studies have shown that during the luteal phase woman consume more carbohydrates , proteins and fats and that hour energy expenditure shows increases between 2.

Females with premenstrual syndrome PMS report changes in appetite across the menstrual cycle more than non-sufferers of PMS, possibly due to their oversensitivity to changes in hormone levels.

No difference for preference of food types has been found between PMS sufferers and non-sufferers. The different levels of ovarian hormones at different stages of the cycle have been used to explain eating behavior changes.

Progesterone has been shown to promote fat storage, causing a higher intake of fatty foods during the luteal phase when progesterone levels are higher.

It is theorized that the use of birth control pills should affect eating behaviour as they minimise or remove the fluctuations in hormone levels.

Serotonin is responsible for inhibiting eating and controlling meal size, [76] among other things, and is modulated in part by ovarian hormones. A number of factors affect whether dieting will affect these menstrual processes: age, weight loss and the diet itself.

First, younger women are likely to experience menstrual irregularities due to their diet. Second, menstrual abnormalities are more likely with more weight loss.

For example, anovulatory cycles can occur as a result of adopting a restricted diet, as well as engaging in a high amount of exercise.

Studies investigating effects of the menstrual cycle on alcohol consumption have found mixed evidence. The level of substance abuse increases with PMS, mostly with addictive substances such as nicotine , tobacco and cocaine.

Infrequent or irregular ovulation is called oligoovulation. Normal menstrual flow can occur without ovulation preceding it: an anovulatory cycle.

In some cycles, follicular development may start but not be completed; nevertheless, estrogens will be formed and stimulate the uterine lining.

Anovulatory flow resulting from a very thick endometrium caused by prolonged, continued high estrogen levels is called estrogen breakthrough bleeding.

Anovulatory bleeding triggered by a sudden drop in estrogen levels is called withdrawal bleeding. Very little flow less than 10 ml is called hypomenorrhea.

Regular cycles with intervals of 21 days or fewer are polymenorrhea ; frequent but irregular menstruation is known as metrorrhagia.

Sudden heavy flows or amounts greater than 80 ml are termed menorrhagia. The term for cycles with intervals exceeding 35 days is oligomenorrhea.

The term for painful periods is dysmenorrhea. The menstrual cycle can be described by the ovarian or uterine cycle. The ovarian cycle describes changes that occur in the follicles of the ovary whereas the uterine cycle describes changes in the endometrial lining of the uterus.

Both cycles can be divided into three phases. The ovarian cycle consists of the follicular phase, ovulation, and the luteal phase, whereas the uterine cycle consists of menstruation, proliferative phase, and secretory phase.

The follicular phase is the first part of the ovarian cycle. During this phase, the ovarian follicles mature and get ready to release an egg.

Through the influence of a rise in follicle stimulating hormone FSH during the first days of the cycle, a few ovarian follicles are stimulated.

Under the influence of several hormones, all but one of these follicles will stop growing, while one dominant follicle in the ovary will continue to maturity.

The follicle that reaches maturity is called a tertiary or Graafian follicle, and it contains the ovum. Ovulation is the second phase of the ovarian cycle in which a mature egg is released from the ovarian follicles into the oviduct.

When the egg has nearly matured, levels of estradiol reach a threshold above which this effect is reversed and estrogen stimulates the production of a large amount of LH.

The exact mechanism of these opposite responses of LH levels to estradiol is not well understood. The release of LH matures the egg and weakens the wall of the follicle in the ovary, causing the fully developed follicle to release its secondary oocyte.

If it is not fertilized by a sperm, the secondary oocyte will degenerate. The mature ovum has a diameter of about 0. Which of the two ovaries—left or right—ovulates appears essentially random; no known left and right co-ordination exists.

After being released from the ovary, the egg is swept into the fallopian tube by the fimbria , which is a fringe of tissue at the end of each fallopian tube.

After about a day, an unfertilized egg will disintegrate or dissolve in the fallopian tube. Fertilization by a spermatozoon , when it occurs, usually takes place in the ampulla , the widest section of the fallopian tubes.

A fertilized egg immediately begins the process of embryogenesis , or development. The developing embryo takes about three days to reach the uterus and another three days to implant into the endometrium.

In some women, ovulation features a characteristic pain called mittelschmerz German term meaning middle pain. The luteal phase is the final phase of the ovarian cycle and it corresponds to the secretory phase of the uterine cycle.

During the luteal phase, the pituitary hormones FSH and LH cause the remaining parts of the dominant follicle to transform into the corpus luteum, which produces progesterone.

The increased progesterone in the adrenals starts to induce the production of estrogen. The hormones produced by the corpus luteum also suppress production of the FSH and LH that the corpus luteum needs to maintain itself.

But getting it any time between age 10 and 15 is OK. Every girl's body has its own schedule. There isn't one right age for a girl to get her period.

But there are some clues that it will start soon:. A period happens because of changes in hormones in the body. Hormones are chemical messengers.

The ovaries release the female hormones estrogen and progesterone. These hormones cause the lining of the uterus or womb to build up.

The built-up lining is ready for a fertilized egg to attach to and start developing. If there is no fertilized egg, the lining breaks down and bleeds.

Then the same process happens all over again. It usually takes about a month for the lining to build up, then break down.

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Des halb sich nur die TWh zu betrachten und nicht in welcher Energieform die Vorhanden ist etwas schleierhaft.
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Der grüne Strom kann aber nur einmal genutzt werden, und muss bereits für den Ersatz der Kernkraft herhalten. A period is a release of blood from a girl's uterus, out through her portagecanalsociety.com is a sign that she is getting close to the end of puberty.. There is a lot to learn about . Szukasz dobrego lekarza ze specjalizacji Periodontolog z miasta Warszawa? Sprawdź listę 34 polecanych lekarzy z tej kategorii - umów wizytę online! k Followers, Following, Posts - See Instagram photos and videos from CHRISS, PERIOD. (@chrissperiod).

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