What occurs in the uiterus as an egg matures in an ovary?
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the egg called ovum.....\n\nmillions of sperms are transferred from the male body to the female vagina....\n\nsperms swim through the cervix to the female uterus.....\n\nsperms swim towards the ovum in the Fallopian tube...\n\nfertilisation occurs in the fallopian tube\n\nonly one sperm will fuse with one ovum to produce a zygote\n\nthe zygote produced divides many times and develops into an embryio on its way to the uterus\n\nfinally, the embryio implants itself to the uterus wall which is rich with blood.....\n\nI hope it helps you with your homework!
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Ovarian cysts form for numerous reasons. The most common type is a follicular cyst, which results from the growth of a follicle. A follicle is the normal fluid-filled sac that contains an egg. Follicular cysts form when the follicle grows larger than normal during the menstrual cycle and does not open to release the egg. Usually, follicular cysts resolve on their own over the course of days to months. Cysts can contain blood (hemorrhagic or endometrioid cysts) from injury or leakage of tiny blood vessels into the egg sac. If a woman is in her 40's, or younger, and has regular menstrual periods, most ovarian masses are "functioning ovarian cysts," which are not really abnormal. They are related to the process of ovulation that happens with the menstrual cycle. They usually disappear on their own during a future menstrual cycle. Therefore, especially in women in their 20's and 30's, these cysts are watched for a few menstrual cycles to verify that they disappear. Because oral contraceptives work in part by preventing ovulation, physicians will not really expect women who are taking oral contraceptives to have common "functioning ovarian cysts." Thus, women who develop ovarian cysts while taking oral contraceptives may be advised against simple observation; rather, they may receive closer monitoring with pelvic ultrasound or, less commonly, surgical exploration of the ovary. Functional ovarian cysts cannot be prevented if you are ovulating. Anything that makes ovulation less frequent reduces your chance of developing an ovarian cyst. Birth control pills, pregnancy, and breast-feeding in the first 6 months following birth prevent ovulation. Ovulation ceases when menopause is complete. Women who use high-dose birth control pills have a modestly decreased risk of developing functional ovarian cysts; low-dose birth control pills seem to have a less preventive effect.
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The eggs of fish are fertilized either externally or internally, depending on species. The female usually lays the eggs and the embryos in the eggs develop and hatch outside her body. This kind of fish are called oviparous fish. Oviparous fish develop being obtaining food from the yolk in the egg. Salmon, for example, are oviparous. Ovoviviparous fish keep the eggs inside of the mother's body after internal fertilization. Each embryo develops in its own egg. The young are "born alive" like most mammals. Some species of fish, such as various sharks, are viviparous. Viviparous fish allow their embryos to stay in the mother's body like ovoviviparous fish. However, the embryos of viviparous fish obtain needed substances from the mother's body, not through material in the egg. The young of viviparous species are also "born alive".
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the egg stays where it is - in the ovary. it turns into seed there. so the pollen must germinate (into a structure called pollen tube) and this tube grows through the pistil and delivers the germ cells to fertilize the egg. cut open a ripening seed pod of a flower and u will see the growing seeds. or imagine a green pepper cut open or green peas in the pod -  the seeds are attached to something that is called placenta, actually. and before fertilization they were not seeds but eggs. and through this place of attachment they were fertilized. it is not like human egg that itself travels from ovary to uterus and gets fertilized on the way.
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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.
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Polar bodies form in meiosis, particularly during meiotic division of sex cells in females.
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During bird breeding season, in response to hormones from the pituitary gland , the male's testes become several hundred times larger than normal to produce sperm, with the left testis usually larger. The female bird's ovaries also enlarge during breeding season to produce the ovum. \n\nIn birds, an ovum is fertilized in the female bird's oviduct by a sperm cell from the male bird. Once fertilized, the ovum becomes the nucleus of the egg. The egg, that has its own food source, the yolk, will be laid by the female into her nest, incubated, and then the baby bird will hatch.\n\nBut how does the sperm from the male bird get into the female? How can they have intercourse without any external male organs, such as a penis? The male's sperm, produced in the testes, passes to the cloaca where it is stored until copulation (act of sex). The female also has a cloaca that leads from the ovaries. The female bird unfans her tail, moves it to one side while the male climbs up onto her back or gets close to her. Their cloacas are pressed together and the sperm moves from the male to the female. This act is called a cloacal kiss. \n\nThe sperm is stored by the female for at least a week, in some species over a hundred days. Then as each ovum from the ovary moves into the oviduct, it gets fertilized with the stored sperm, producing a clutch of many eggs, all with the sperm from that one cloacal kiss.\n\nThere are a few species of birds where the males do possess a retractable penis that can be pulled back into the bird. These birds include ostriches, cassowaries, kiwis, swans, geese, and ducks. Since waterfowl sometimes make love while in the lake or pond, the penis helps ensure that the sperm is not washed away by the water.\n\nSperm can be transferred from male cloaca to the female in a blink of an eye - less than a second. Some birds seem to want to linger longer though, sometimes having sex for more than an hour! And, although it is not necessary to copulate frequently since the sperm is stored within the female, remember those hormones are still making the birds excited. Many pairs of birds will mate numerous times within a few days.
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During ovulation time...right before she starts her period. She is packed with eggs. And try not to ma$turbate too much to make sure your full and ready.
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The human egg or ovum is a single cell or female gamete.  The ovum is fertilized when the male gamete called sperm enters the egg and their halves of the DNA combine.\n\nThe fertilized ovum / sperm combined cell is called a zygote.\n\nThe zygote splits repeatedly into more cells with differing levels of specialization, eventually developing into an embryo through to a baby.\n\nNo, it is not covered with a shell like a bird's egg.
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when the sperm fertilizes the egg
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Around the time of ovulation.\n\nThis is the time where an egg is released from the ovaries and travels down the fallopian tube.  It then gets fertilised whilst in the tube and then embeds inself in the uterus wall lining.\n\nThe time when this happens is usually fourteen days after the completed menstrual cycle (i.e. fourteen days after the girl has finished her period).
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to allow the eggs to be released from the ovaries and travel into the fallopiian tubes.
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I'm not quite sure I understand... but when something is fertilised internally, it's fertilised within a body. When it's fertilised externally, the eggs are outside the body and the male spreads his sperm over the eggs.\n\nInternal development would be when the embryo develops inside the mother's body. External development would be when the embryo develops in an egg or something.
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From http://en.wikipedia.org/wiki/Menstrual_cycle\n\nOnly human beings and the great apes experience a true menstrual cycle. Most placental mammals experience estrus instead. The menstrual cycle is under the control of the reproductive hormone system and is necessary for reproduction. In women, menstrual cycles occur typically on a monthly basis between puberty and menopause.\n\nDuring the menstrual cycle, the sexually mature female body releases one egg (or occasionally two, which might result in dizygotic, or non-identical, twins) at the time of ovulation. The lining of the uterus, the endometrium, builds up in a synchronised fashion. After ovulation, this lining changes to prepare for potential implantation of the fertilized egg to establish a pregnancy. If fertilization and pregnancy do not ensue, the uterus sheds the lining and a new menstrual cycle begins. The process of the shedding of the lining is called menstruation. Menstruation 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.\n\nCommon usage refers to menstruation and menses as a period. This bleeding serves as a sign that a woman has not become pregnant. (However, this cannot be taken as certainty, as sometimes there is some bleeding in early pregnancy.) During the reproductive years, failure to menstruate may provide the first indication to a woman that she may have become pregnant. A woman might say that her "period is late" when an expected menstruation has not started and she might have become pregnant.\n\nMenstruation forms a normal part of a natural cyclic process occurring in healthy women between puberty and the end of the reproductive years. The onset of menstruation, known as menarche, occurs at an average age of 12, but can occur any time between the ages of 8 and 16.[1] However, the condition precocious puberty has caused menstruation to occur in girls as young as 8 months old. The last period, menopause, usually occurs between the ages of 45 and 55. Deviations from this pattern deserve medical attention. Amenorrhea refers to a prolonged absence of menses during the reproductive years of a woman for reasons other than pregnancy. For example, women with very low body fat, such as athletes, may cease to menstruate. The presence of menstruation does not prove that ovulation took place; women who do not ovulate may have menstrual cycles. Those anovulatory cycles tend to take place less regularly and show greater variation in cycle length. In addition, the absence of menstruation also does not prove that ovulation did not take place, because hormone disruptions in non-pregnant women can suppress bleeding on occasion.\n\nWomen show considerable variation in the lengths of their menstrual cycles, and the length of the menstrual cycle differs in different animals.\n\nWhile cycle length may vary, 28 days is generally taken as representative of the average ovulatory cycle in women. Convention uses the onset of menstrual bleeding to mark the beginning of the cycle, so the first day of bleeding is called "Cycle Day one".\n\nOne can divide the menstrual cycle into four phases:\n\nMenstruation\nEumenorrhea denotes normal, regular menstruation that lasts for a few days (usually 3 to 5 days, but anywhere from 2 to 7 days is considered normal.[2] The average blood loss during menstruation is 35 millilitres with 10-80 mL considered normal;[3] many women also notice shed endometrium lining that appears as tissue mixed with the blood. An enzyme called plasmin — contained in the endometrium — inhibits the blood from clotting. Because of this blood loss, women have higher dietary requirements for iron than do males to prevent iron deficiency. Many women experience uterine cramps, also referred to as dysmenorrhea, during this time
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The Yolk: The chicken egg starts as an egg yolk inside a hen. A yolk (called an oocyte at this point) is produced by the hen's ovary in a process called ovulation.\n\nFertilization: The yolk is released into the oviduct (a long, spiraling tube in the hen's reproductive system), where it can be fertilized internally (inside the hen) by a sperm.\n\nThe Egg White (albumin): The yolk continues down the oviduct (whether or not it is fertilized) and is covered with a membrane (called the vitelline membrane), structural fibers, and layers of albumin (the egg white). This part of the oviduct is called the magnus.\n\nThe Chalazae: As the egg goes down through the oviduct, it is continually rotating within the spiraling tube. This movement twists the structural fibers (called the chalazae), which form rope-like strands that anchor the yolk in the thick egg white. There are two chalazae anchoring each yolk, on opposite ends of the egg.\n\nThe Eggshell: The eggshell is deposited around the egg in the lower part of the oviduct of the hen, just before it is laid. The shell is made of calcite, a crystalline form of calcium carbonate.
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A process by which an ovary is removed, fixed, embedded in paraffin and serially sectioned. The sections are mounted in order on glass microscope slides and stained with a vital dye, such as haematoxylin�8364;“eosin. The total number of healthy versus dead/dying oocytes per section is then determined by light microscopic analysis.
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An anther is the pollen-bearing part of the stamen. An ovary is the ovule-bearing lower part of a pistil that ripens into a fruit. A plant does not need all it's fruits to survive so it is probably this one. A sepal is one of the separate, usually green parts forming the calyx of a flower. An ovule is a minute structure in seed plants, containing the embryo sac and surrounded by the nucellus, that develops into a seed after fertilization.\n\nIn some species, unisexual (male or female) flowers are produced on separate plants. So a "male" plant would not need an ovary. Some plants have both male and female parts on one plant but other species have just the male or just the female.\n\nI could be wrong. I'm not 100% sure. Did they pass your test back with the answer marked wrong but the teacher didn't write in the right answer but you need to know it for the final? If so, which one did you pick that was marked wrong?