Why does the endometrium lining slough if the ovum is not fertilized?
543847
Well, it's like this:\n\nThere are four phases of a woman's menstrual cycle:\n-menstrual phase\n-proliferative phase \n-ovulatory phase\n-secretory phase\n\nDuring the proliferative phase, which occurs between the end of a woman's menstrual period and ovulation, the uterine endometrium undergoes a process of growth as a result of the stimulation of ESTROGEN.  (key word, estrogen)\n\nDuring the ovulatory phase, the Graafian follicle in the ovary ruptures and releases the ovum around 14 days after the start of menstruation.  The concentration of ESTROGEN is very high in the blood and it stimulates ovulation.  The blood vessels of the endometrial lining ENLARGE and GROW and some secretory cells are formed.\n\nIn the secretory phase, b/w ovulation and onset of menstruation, the endometrium is under the influence of both progesterone and ESTROGEN, increases in size and becomes thick, the endometrial glands become enlarged, and the blood vessels become coiled and enlarged.  (this all caused by levels of hormones)\n\nIf, during this phase, the ovum becomes fertilized and implants itself in the lining of the uterus, the CORPUS LUTEUM (a yellow, progesterone-producing mass of cells that form from the egg after ovulation) somewhat "senses" fertilization and remains to secrete progesterone which helps the embryo grow within in the uterus.  If the ovum is not fertilized, the corpus luteum disintegrates and the progesterone level falls sharply.  Fourteen days later, the endometrial lining, all those enlarged blood vessels, cell debris are discharged.  (menses) \n\nBasically that corpus luteum is kind of like a "radar detector" for changing hormone levels and sperm.  When that radar goes off after sensing sperm, the uterus essentially "slams on the brakes" and stops.  (Much like we tend to do when we see that state trooper hiding behind those bushes on the highway)  Growth of an embryo begins.  \nIf we don't hear a beep, we just keep on driving.  And the cycle continues.\n\nIt all seems so intriguing, the way the whole process works, that one can't help but marvel at how mysteriously the Lord did His work in creating us.  No man could ever have devised His plan for our cycle of life.  It's amazing to even think about.  \n\nHope this helps.
326454
Every month, one egg leaves one of the ovaries on its way to the uterus via the fallopian tubes. Meanwhile, in preparation for the egg, the uterus starts to develop a thicker lining and it’s walls become cushiony (the endometrial lining). If the egg reaches the uterus and is fertilized by a sperm cell, it attaches to this cushiony wall.\nTo start with, always remember that pregnancy and periods can never go along simultaneously. If you are indeed pregnant, technically, you cannot get your periods. Missing your period is actually the first sign of pregnancy. Bleeding in early pregnancy is a common occurrence, but this does not signal a true menstrual cycle. You must realize that the hormones that are active during pregnancy totally prevent ovulation. As we know, ovulation is the time in your cycle when the egg is released into the uterus and women experience menstrual bleeding. Since the egg in pregnant women is already fertilized, ovulation does not occur and hence no bleeding.\n\n\nEarly Pregnancy Bleeding\nHowever, it is not uncommon to find that many women do report getting what seem like regular periods during early pregnancy. The bleeding that pregnant women complain about though is not truly a menstrual period. It can be called as early pregnancy bleeding. The perception of having a menstrual period (or more than one) in early pregnancy can confuse the due date and delay some pregnant women from seeking appropriate and timely medical care. In instances where a couple is unaware that they are expecting, it can be particularly emotionally challenging to find out about the pregnancy at the same time they are told that the bleeding might signal a problem.\nIt can be hard to calculate your date of delivery when you aren't sure which period was the true last menses. A number of timing issues can help provide a ballpark estimate of when conception took place. Pay attention to these dates for help - when did you have unprotected intercourse, when did the pregnancy test turned positive (especially if there were some negative results before the positive one), and when you first noticed symptoms of pregnancy (such as breast tenderness or nausea). An ultrasound is the best technique to determine the baby's due date if you are not sure about one or more of these dates.\n\nIdentifying the due date is quite important in prenatal care, since some tests, like the triple check, are standardized by the exact number of weeks of gestation. In addition, most couples as well as their practitioner want to have some idea of when to expect the baby. Here are some explanations for what may seem like regular menstrual flow when you are pregnant.\n\nMost of the time the egg just passes right through without fertilization. Since the uterus no longer needs the extra blood and tissue which made up the walls thick, it sheds them by way of the vagina. This cycle will happen nearly every month until the ovaries stop releasing eggs, usually several decades later. (Menopause).
1009904
The eggs are nourished within the ovaries, and each month one fully matured egg is released. A mature egg has undergone a process of cell division that gives it 23 chromosomes -- just enough to match an equal number of chromosomes from the sperm. Once an egg is released from an ovary, it's pulled into one of the fallopian tubes leading to the uterus. But one of the 20 million to 200 million sperm released by the man has to catch up to that egg soon: If the egg doesn't encounter a healthy sperm, it will perish in 24 to 36 hours. In that case, it disintegrates and flows out with your period. If the egg does get fertilized, it leaves the fallopian tube and travels into the uterus. If everything is in good working order, it will implant there and begin to develop into a baby.
856100
Mammalian ovum is round and that helps in its movement through the fallopian tube since it does not have a tail like the sperm.  But the ovum is not smooth over the surface due to layers of cells.  Read through and i think my answer will help u..................The zona striata or zona pellucida is a thick membrane, which persists for some time after fertilization has occurred, and may serve for protection during the earlier stages of segmentation.  The phenomena attending the discharge of the ova from the follicles belong more to the ordinary functions of the ovary.
487361
The capacitated spermatozoon and the oocyte meet and interact in the ampulla of the fallopian tube. In mammals, binding of the spermatozoon to the zona pellucida, an extracellular layer surrounding the oocyte, initiates the acrosome reaction. This process releases the enzyme hyaluronidase, which digests the matrix of hyaluronic acid in the vestments surrounding the oocyte. Fusion between the sperm and oocyte plasma membranes follows, allowing the entry of the sperm nucleus, mitochondria, centriole and flagellum into the oocyte. Once the ovum fuses with a single sperm cell, its cell membrane changes, preventing fusion with other sperm.\n\nThis process ultimately leads to the formation of a diploid cell called a zygote. When the zygote reaches the uterus and implants in the endometrium, the female is said to be pregnant.\n\nIf fertilisation takes place, the sperm usually meet the ovum in the fallopian tube, requiring the sperm cells to swim from the upper vagina through the cervix and across the length of the uterus before reaching the fallopian tube—a considerable distance compared to the size of the sperm cell.\n\n\nFertilization in plants\n\nAfter the pistil is pollinated, the pollen grain germinates in a response to a sugary fluid secreted by the mature stigma. From each pollen grain, a pollen tube grows out attempting to travel into the ovary by creating a path. The vegetative and generative nuclei of the pollen grain pass into its respective pollen tube. The growth of the pollen tube is controlled by the vegetative nucleus. Enzymes are secreted to digest the tissue of the stigma a style as the polen tube grows. The pollen tube does not directly reach the ovary in a straight line. It travels near the skin of the style and curls to the bottom of the ovary, then near the receptacle, it breaks through the ovule through the microphyle (an opening in the ovule wall) and reaches the ovum to fertilise it. This is the point when fertilisation actually occurs. After being fertilised, the ovary starts to swell and becomes a fruit.\n\nWith multi-seeded fruits, multiple grains of pollen are necessary for syngamy with each ovule. The process is easy to visualise if one looks at maize silk, which is the female flower of corn. Pollen from the tassel (the male flower) falls on the sticky external portion of the silk, and then pollen tubes grow down the silk to the attached ovule. The dried silk remains inside the husk of the ear as the seeds mature; if one carefully removes the husk, the floral structures may be shown. The development of the flesh of the fruit is proportional to the percentage of fertilised ovules. For example, with watermelon, about a thousand grains of pollen must be delivered and spread evenly on the three lobes of the stigma to make a normal sized and shaped fruit.
67459
If you suspect you are pregnat, STOP TAKING THE BIRTH CONTROL!!!!! The hormone in birth control causes the endometrium in the uterus to thin out creating a "hostile enviroment in the uterus". The fertilized egg, fetus, may not be able to thrive in this situation. In fact that is the purpose of birth control. There are three ways that b.c. eliminates ability for pregnacy to take place and or continue. Number one, it slows or prevents the ability for sperm to travel where they need to go. Secoundly it may prevent ovulation, or sterilize the egg. Thirdly if the sperm makes it through these barriers and the egg is released despite the contraceptive you have a baby on your hands. And the third means of prevention is not prevention at all but abortion. All of this included in that little pill. Please see the link I have included. It gives a more detailed description of whats going on and why this is so unpopular belief.\n\n\n\nhttp://www.epm.org/articles/26doctor.html
69362
The endometrium is the tissue that lines the uterus. During each menstrual cycle, a new endometrium grows, preparing for a possible pregnancy. If you do not become pregnant during that cycle, the endometrium is shed, which you know as your menstrual period. Endometriosis is endometrium tissue that grows outside of the uterus. This usually occurs on the ovaries, the fallopian tubes, the outer surface of the uterus, the bowels, or other abdominal organs. Rarely, it can affect other organs and structures in the body. Endometriosis that does not cause symptoms or causes only mild symptoms usually does not require medical treatment.  Treatment of endometriosis that is causing moderate to severe pain includes:\nIdentification and removal of endometrial tissue throughlaparoscopy. Endometrial implants may be destroyed by laser beam or electric current (electrocautery), or cut away and removed during the procedure. \nUse of medications that shrink the endometrial implants and control symptoms. \nSurgery to remove the uterus and ovaries (hysterectomy and oophorectomy). Many women with endometriosis can conceive naturally. For those who have difficulty, surgery often provides a "window of opportunity" during which the chances of conception increase. In a study that was done, 172 women underwent laparoscopic treatment of endometriosis. Of those, 50 became pregnant within 36 weeks. The authors attributed a 13% increase in the probability of pregnancy to the surgical treatment.
537538
Since the egg can't get past the 'knot' (it's usually cauterized though) it just sits in the fallopian tube until the body reabsorbs it. The sperm stays on the other side of the knot so they they never meet. Since the uterus is unaffected, you still have normal menstruation.
134344
It could be a cyst,it could be that you are ovulating,it could be endometriosis,or ectopic pregnancy. When women ovulate the experience sharp pain on the side which carries the ovary they are ovulating from that month. If it is very painful go to see your gynecologist.
851004
If she still has her ovaries, it might be possible to fertilize an egg, but without a uterus, there will be no baby.  She could donate her eggs for someone else to use though.
427914
During a menstrual cycle the uterine lining builds up in preparation for an egg to be fertilized.  If the egg is not fertilized, the extra tissues are not needed, so they are shed along with blood during a period.
483159
The egg is fertilized in the Fallopian tube.
930683
Its because of the endometriosis!
1115461
It's a pain, It happens when the females egg isn't fertilized, it's removed from the body and than a new one is put in it's place.\n\nIf fertilization and pregnancy do not ensue, the uterus sheds the lining, culminating with menstruation, which marks the low point for estrogen activity. This manifests itself to the outer world in the form of the menses (also menstruum): essentially part of the endometrium and blood products that pass out of the body through the vagina. Although this is commonly referred to as blood, it differs in composition from venous blood.
550763
its genetics. A uterus doesn't "become" tilted. It is or has always been that way. I have the same issue, and it was diagnosed about 12 years ago. Uterine placement is not something common, so it is not looked for or noticed in routine paps. It can hinder conception as the sperm have a harder time getting up "the slope" per se.
55901
The eggs and sperm are reabsorbed by the body if they  can not be used.\n\nLink below will give you all the details.
813457
When you are ovulating you are at your most fertile so definately do not have unprotected sex because you are highly likely to conceive.\n\nAs for your pains some women experience  discomfort others do not but you should go to your doctor and get checked out as your fallopians may be blocked making you susceptible to ectopic pregnancy or you may have cysts or infection which could be causing you pain.