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Which two hormones controlling the menstrual cycle are produced in the pituitary gland?
The two hormones are LH and FSH. Both are necessary for proper function of the ovary. Together they produce a mature egg. After the egg is released and not fertilized, menstruation will occur. Menstruation occurs when the lining of the uterus is "lost" since it doesn't need to be ready to accept a zygote (fertilized egg).
The surge in LH secretion from the anterior pituitary that causes ovulation can be partially explained by the?
positive feedback of estradiol that increases the release of LH
What hormone is primarily responsible for egg maturation and the distribution of fat in females?
The hormone LH
Egg cell production?
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: 09/16/2008Dan Sacks MD, FACOG, Obstetrics & Gynecology in Private Practice, West Palm Beach, FL. Review provided by VeriMed Healthcare Network.
What is the function of the LTH hormone?
At puberty, the hypothalamus produces GnRH (gonadotropin releasing hormone.) GnRH then stimulates production of LH (leutinizing hormone) and FSH (follicle stimulating hormone)which are released by the pituitary gland. In males, LH causes secretion of testosterone and other androgens by the interstitial cells (located in between the seminiferous tubules in the testies.) Testosterone,among others duties, aids FSH in the stimulation of spermatogenesis (production of spermatozoa) and promotes the functional maturation of spermatozoa.
What happens during the fertilization process.?
an egg is released from the ovary's
Can you not have a lh surge but have an estrogen surge?
Yes.
Lh surge indicates pregnancy?
A Lh surge (known as the luteal surge) indicates ovulation, not pregnancy. The luteal surge causes the follicle to burst which releases the egg into the body cavity, it is then drawn into the fallopian tubule where fertilization occurs. An increase in HCG indicates pregnancy, HCG in blood and urine is the first outward sign of pregnancy.
Which two hormones controlling the menstrual cycle are produced in the pituitary gland?
The two hormones are LH and FSH. Both are necessary for proper function of the ovary. Together they produce a mature egg. After the egg is released and not fertilized, menstruation will occur. Menstruation occurs when the lining of the uterus is "lost" since it doesn't need to be ready to accept a zygote (fertilized egg).
What happens when the level of LH is high?
When your body has an LH surge, you are ovulating and may become pregnant.
A sudden surge in lh concentration causes?
a surge of testosterone in males and it causes ovulation in females.
Is LH produced in contraceptive pills?
The morning after pill disrupts the LH surge. That's part of how it works. The morning after pill does not contain LH.
Ovulation occurs due to a surge in?
LH - leuteinizing hormone
What is the mid cycle events stimulates by a surge of LH?
ovulat
Will you be able to detect LH surge if you are breast feeding?
No, only prolactin.
The surge in LH secretion from the anterior pituitary that causes ovulation can be partially explained by the?
positive feedback of estradiol that increases the release of LH
Is it possible to ovulate 24 hours after detecting a surge in LH?
OK, first a bit of background on LH (luteinizing hormone). This is released in two parts of your cycle, right at the beginning to mature an egg and in the middle of the cycle to cause ovulation. According to my notes, ovulation occurs approx. 34-36 hours after the onset of the LH surger or 10-12 hours after the LH peak. I do not know the specifics of your test, but if it tests for a peak LH level, then the egg will be released 10-12 hours after the peak. If it just detects a rise in LH, then it will be approx a day and a half later. Hope that helps. Student Doctor.
