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Menstruation
Menstruation is the routine discharge, or release, of blood and mucosal tissue from the uterus. This process occurs about once a month from the time a female reaches puberty until menopause. During pregnancy, the monthly menstrual cycle is absent while the womb nourishes the growing fetus.
10,301 Questions
What causes the breakdown of the uterine lining if the implantationof a zygote does not occur?
As part of the menstrual cycle, the engrossing of the uterus is due to the production of progesterone in the ovaries (induced by LH), the drop in progesterone during the last days of the cycle due to the degeneration of the corpus luteum is what triggers the menstruation.
If a zygote implants in the endometrium, it starts producing hCG, a hormone that stops the degeneration of the corpus luteum so progesterone levels don't drop.
As such, if the zygote doesn't implant itself in the uterus, the cycle keeps going, the pituitary gland lowers production of LH, produces more FSH, corpus luteum degenerates, progesterone levels lower, strogens rise and menstruation occurs
Dogs licking people is a natural behavior as a way to show affection, seek attention, or explore their environment. However, it's important to teach dogs boundaries and proper behavior to ensure the interaction is safe and comfortable for both parties. Always supervise interactions between dogs and children to prevent any potential issues.
Can someone help you determine when I ovulate next if your last period started on the 17th of sept?
You're likely to be most fertile from September 28, 2008 to October 3, 2008. Fertile days followed by resulting due date
October 26, 2008 - October 31, 2008 July 22, 2009
November 23, 2008 - November 28, 2008 August 19, 2009
December 21, 2008 - December 26, 2008 September 16, 2009
January 18, 2009 - January 23, 2009 October 14, 2009
February 15, 2009 - February 20, 2009 November 11, 2009
March 15, 2009 - March 20, 2009 December 9, 2009 Based on a typical 28 day cycle length.
Which contributes to the lack of evidence of the period of heavy bombardment on earth?
The lack of evidence of the period of heavy bombardment on Earth can be attributed to erosion, tectonic plate activity, volcanic activity, and the geological processes that constantly reshape the Earth's surface over time. These processes can bury, distort, or erase the impact craters and other evidence of the period of heavy bombardment. Additionally, the Earth's dynamic nature and the recycling of its crust through plate tectonics have further obscured the remnants of this early bombardment period.
Why is there so little evidence of the period of heavy bombardment on earth?
The lack of evidence of the period of heavy bombardment on Earth is primarily attributed to geological processes like erosion, plate tectonics, and the presence of water that have erased or altered much of the early Earth's surface. Additionally, the constant recycling of Earth's crust through processes like subduction has also contributed to the limited preservation of impact structures from that period.
For conception to take place, a mature egg cell, or ovum, must be at the right place at the right time. Conception takes place when a sperm penetrates the egg cell and fertilizes it, and the two cells combine to form a new life.
Let's take a quick look at some of a woman's key reproductive organs and see how they function during menstruation and ovulation, two processes that are critical in preparing her for conception.
Here are the uterus, ovaries, fallopian tubes, and vagina.
You can see a cut-away view of one of the ovaries on the right. The purple structures inside the ovary are immature egg cells, or oocytes. All of the 400,000 egg cells a woman will ever produce are already present in her ovaries when she is born, although the eggs are in an undeveloped form.
The average age that girls begin to menstruate is 12 years old. Each menstrual cycle occurs approximately every twenty-eight days. During each cycle, hormonal messages from the brain cause the ovaries to develop a single mature egg cell for potential fertilization, even as other hormones instruct the uterine lining to thicken in preparation for nourishing the fertilized egg cell.
As you may know, hormones are chemicals released into the blood stream by organs or glands. In general, their job is to regulate body functions by either stimulating or inhibiting other cells or organs. The ovaries are just one of the many organs in the body regulated by hormones.
The cycle starts when a follicle grows within one of the ovaries. A follicle is composed of the developing egg cell and the support cells that surround and nourish it.
Throughout the first portion of the cycle, a small structure in the brain, the pituitary, releases hormones, mostly FSH. This causes follicles to begin growing.
One of the follicles becomes dominant and releases estrogen, a hormone that prepares the lining of the uterus to receive a fertilized egg cell. Meanwhile, the estrogen in the blood stream causes the brain to release a surge of LH. In response to the LH surge, the follicle enlarges rapidly. About 24 to 36 hours after the LH surge, the follicle ruptures and releases the egg cell in a process known as ovulation.
The ruptured follicle begins secreting the hormone progesterone, which also helps to prepare the uterine lining for a fertilized egg cell.
The large structure on the right is the entrance to the fallopian tube. The smaller, waving structures at its opening are called fimbriae. They're moving a lot because it's their job to sweep the egg cell into the fallopian tube's entrance and toward the uterus.
Once the egg cell is within the fallopian tube, one of two things will happen to it: it will either be fertilized by a sperm cell, or fertilization will fail to take place.
If the egg cell is NOT fertilized within 12 to 24 hours after its release from the ovary, it will stop developing and will dissolve before reaching the uterus.
The absence of a fertilized egg cell gradually causes a woman's body to stop releasing the hormones that would otherwise prepare the uterus for the developing egg cell. In response, the uterus sheds its lining. Menstruation signifies the start of the next menstrual cycle and lasts from 2 to 7 days.
If the egg cell DOES become fertilized by a sperm, it will be transported by tiny hair-like cells called cilia to the uterus. There, it lodges in the uterine wall in a process called implantation, and receives nourishment from the uterine lining.
Meanwhile, back in the ovary, the remaining cells of the ruptured follicle produce progesterone so that the uterine lining will stay rich in blood vessels, and the fertilized egg cell will survive.
As you can see, the hormones, which control the reproductive system, maintain a delicate balance over the life cycle of the egg cell.
Reviewed ByReview Date: 09/16/2008
Dan Sacks MD, FACOG, Obstetrics & Gynecology in Private Practice, West Palm Beach, FL. Review provided by VeriMed Healthcare Network.
What contributes to lack of evidence of the period of heavy bombardment on earth?
Weathering, plate movements, and volcanoes destroyed many of the craters. The factors contribute to the lack of evidence of heavy bombardment of earth.
This evidence was subducted or, if not subducted, weathered; since Earth was and still is a "living" planet, meaning a planet with active plate tectonics and an active hydro/atmosphere. This activity is in contrast to the Moon, where plate tectonics stopped shortly after its formation and where a hydro/atmosphere could never form. Both because the Moon was simply too small (and thus too light) to sustain plate tectonics and to keep volatiles with him/her.
What contributes to the lack of evidence of the period of heavy bombardent on earth?
Weathering, plate movements, and volcanoes destroyed many of the craters. The factors contribute to the lack of evidence of heavy bombardment of earth.
This evidence was subducted or, if not subducted, weathered; since Earth was and still is a "living" planet, meaning a planet with active plate tectonics and an active hydro/atmosphere. This activity is in contrast to the Moon, where plate tectonics stopped shortly after its formation and where a hydro/atmosphere could never form. Both because the Moon was simply too small (and thus too light) to sustain plate tectonics and to keep volatiles with him/her.
Can a woman without a womb menstruate?
No, a woman cannot menstruate without a womb. Menstruation occurs when the lining of the uterus sheds each month through the cervix and vagina. Without a womb, there is no lining to shed, so menstruation cannot occur.
Progesterone
Can a boy know by looking at a girl is going through her period?
No, for the most part a boy cannot tell that a girl is menstruating simply by looking at her.
There can be some ways to tell by looking alone, for example if she is unfortunate enough to experience a leak while the boy is around or her menstrual pads are showing somehow. In some cases girls skin may worsen, such as acne break-outs on the chin, but this isn't true for all girls at all times.
How long is the menstrial cycle of female?
The menstrual cycle in females typically lasts around 28 days, but it can vary between 21 to 35 days. The cycle begins on the first day of menstruation and ends on the day before the next period starts.
Why is the so little evidence of the period of heavy bombardment on earth?
The lack of evidence of the period of heavy bombardment on Earth is primarily due to the dynamic nature of our planet's surface, which has been reshaped by processes such as erosion, plate tectonics, and volcanic activity. Additionally, Earth's geological activity has continuously recycled its surface through processes like melting and subduction, further obscuring ancient impact craters.
What is the name of the lining of the uterus at shed during the menstrual cycle?
The lining of the uterus shed during the menstrual cycle is called the endometrium. It is the innermost layer of the uterus that thickens in preparation for potential pregnancy and is shed if fertilization does not occur.
A periodical is a publication that is issued at regular intervals of more than one day. For example, weekly or monthly.
Brown simply means old blood. It's normal if your period is light.
Blood that has mixed with discharge and taken time to leave your body can turn brown - just like blood from any other part of your body may go brown.
Why do blood and mucus leave a woman's body once a month what is the process called?
The process is called menstruation, and the reason is that a woman's body cyclically prepares to carry a baby, but has to renew the internal preparations monthly, and so the lining that was prepared is expelled.
It is possible that the little Burgundy stain could be the start of your period. If it only happens once and there are no other signs of menstruation, it may just be spotting or a minor incident. Keep track of any other symptoms to determine if it is your actual period starting.
When does menstrual cycle begin?
In the United States, the average age for a girl to get her first period is 12. This does not mean that all girls start at the same age. A girl can start her period anytime between the ages of 8 and 15. Most of the time, the first period starts about 2 years after breasts first start to develop. If a girl has not had her first period by age 15, or if it has been more than 2 to 3 years since breast growth started, she should see a doctor.
What is length of menstrual cycle?
The typical menstrual cycle is around 28 days long. Everyone has a different cycle length, also it's normal for there to be a few days variation from one cycle to the next.
Does vaginal white discharge stop before period?
Vaginal white discharge can vary throughout the menstrual cycle, but it may lessen just before menstruation due to hormonal fluctuations. It's normal for the amount and consistency of discharge to change during different stages of the menstrual cycle. If you experience any unusual changes in discharge, it's important to consult with a healthcare provider.
When menstruation occurs on a regular basis what is it called?
When menstruation occurs on a regular basis that is the norm, there is no special word to explain this. When you get your period on a regular basis it is simply known as a regular menstrual cycle, it's a positive and normal thing.
Can a girl menstruate for just two days?
Yes, some girls may have shorter menstrual cycles that last for only two days. This can be considered normal as long as there are no other symptoms or changes in their menstrual cycle pattern. However, if someone experiences significant changes in their menstrual cycle, it's a good idea to speak with a healthcare provider.
Why do I menstruate just for two days?
Menstrual patterns can vary for each person, and a two-day period is within the range of normal. It could be due to factors like hormonal changes, stress, or lifestyle habits. If you are concerned about your menstrual cycle, it's best to speak with a healthcare provider for personalized advice.
Which days during the menstrual cycle does menstruation menses occur?
Menstruation occurs at the start of the menstrual cycle and normally lasts around a week, so menstruation would occur days 1-7 of the menstrual cycle.
