| 单词 | FSH |
| 例句 | A negative feedback system occurs in the male with rising levels of testosterone acting on the hypothalamus and anterior pituitary to inhibit the release of GnRH, FSH, and LH. Concepts of Biology 2013-04-25T00:00:00Z Explain how the absence of direct contact among the GnRH neurons and the coordinated release of FSH and LH suggest another timing mechanism. Biology for AP Courses 2022-06-09T00:00:00Z GnRH activates the anterior pituitary to produce LH and FSH, which in turn stimulate Leydig cells and Sertoli cells, respectively. Anatomy and Physiology 2013-06-19T00:00:00Z NHS guidelines also discourage FSH testing for over-45s with classic menopausal symptoms - such as hot flushes - because it adds nothing diagnostically. Shop-bought menopause tests not worth it, women advised 2022-06-09T04:00:00Z FSH graduates are deep into their careers or attending universities throughout the United States. Figure Skating in Harlem: 25 years and growing 2022-04-17T04:00:00Z As with the male, the GnRH from the hypothalamus causes the release of the hormones FSH and LH from the anterior pituitary. Concepts of Biology 2013-04-25T00:00:00Z This inhibits the release of GnRH and FSH, which will cause spermatogenesis to slow down. Biology for AP Courses 2022-06-09T00:00:00Z A negative feedback loop predominantly controls the synthesis and secretion of both FSH and LH. Anatomy and Physiology 2013-06-19T00:00:00Z But experts say the fact FSH levels fluctuate throughout the menstrual cycle and from month to month makes it a poor indicator. Shop-bought menopause tests not worth it, women advised 2022-06-09T04:00:00Z So the glands react by shutting down the production of two hormones - called FSH and LH - which are the key hormones that drive the production of sperm. Male beauty quest 'damages fertility' 2019-05-27T04:00:00Z Slowly rising levels of FSH cause the growth of follicles on the surface of the ovary. Concepts of Biology 2013-04-25T00:00:00Z As with the male, the anterior pituitary hormones cause the release of the hormones FSH and LH. Biology for AP Courses 2022-06-09T00:00:00Z This same process occurs with FSH and inhibin to control spermatogenesis. Anatomy and Physiology 2013-06-19T00:00:00Z "These kits bring a feeling of being in charge of your health by knowing your FSH levels and seeking medical help to combat any of them successfully," it says. Shop-bought menopause tests not worth it, women advised 2022-06-09T04:00:00Z The drug contains a form of progesterone that blocks the production of hormones called LH and FSH that are needed to make sperm. Hopes rise for male contraceptive pill breakthrough 2019-03-25T04:00:00Z The hypothalamus monitors the need for FSH and LH production and release from the anterior pituitary. Concepts of Biology 2013-04-25T00:00:00Z Progesterone assists in endometrial re-growth and inhibition of FSH and LH release. Biology for AP Courses 2022-06-09T00:00:00Z Recall that the high estrogen concentrations will eventually lead to a decrease in FSH as a result of negative feedback, resulting in atresia of all but one of the developing tertiary follicles. Anatomy and Physiology 2013-06-19T00:00:00Z She accused them of using misleading information about "FSH sometimes being a helpful marker of menopause" and called the perimenopause a "hormone rollercoaster". Shop-bought menopause tests not worth it, women advised 2022-06-09T04:00:00Z Men who took the drug had substantially lower levels of LH and FSH compared with those who had the placebo, suggesting the drug had stopped their sperm production. Hopes rise for male contraceptive pill breakthrough 2019-03-25T04:00:00Z She will self-inject FSH once a day for about 10 days, using a small needle. 6 Things To Know About Freezing Your Eggs 2014-10-16T04:00:00Z Slowly rising levels of FSH and LH cause the growth of follicles on the surface of the ovary. Biology for AP Courses 2022-06-09T00:00:00Z Typically they work by providing a constant level of both estrogen and progesterone, which negatively feeds back onto the hypothalamus and pituitary, thus preventing the release of FSH and LH. Anatomy and Physiology 2013-06-19T00:00:00Z Leading menopause and hormone doctor Annice Mukherjee, from the Society of Endocrinology, said FSH urine tests were "another example of exploitation of mid-life women by the commercial menopause industry, who have financial conflicts of interest". Shop-bought menopause tests not worth it, women advised 2022-06-09T04:00:00Z The surge of LH and FSH is so well documented that scientists and doctors can use serum levels of these hormones to track ovulation in animals as well as in humans. Gingrey is a bad doctor, says science 2013-01-14T19:15:07.150Z Thus, testosterone works in a negative feedback loop with LH and FSH to maintain relatively constant levels of testosterone in the blood. Beyond Condoms: The Long Quest for a Better Male Contraceptive 2011-06-14T11:15:00.307Z The progesterone facilitates the regrowth of the uterine lining and inhibits the release of further FSH and LH. Biology for AP Courses 2022-06-09T00:00:00Z Without FSH, the follicles do not mature, and without the LH surge, ovulation does not occur. Anatomy and Physiology 2013-06-19T00:00:00Z The FSH receptor is a protein displayed by cells that latches onto the FSH protein, a hormone that plays several roles in the reproductive system. Protein Implicated in Many Cancers 2010-10-21T15:43:00Z Acute stress can cause surges in FSH and LH that could induce ovulation in species ranging from rats to monkeys and even people, especially if a female is near ovulation to begin with. Gingrey is a bad doctor, says science 2013-01-14T19:15:07.150Z The hypothalamus releases FSH and LH at puberty by the secretion of GHRH. Biology for AP Courses 2022-06-09T00:00:00Z The inhibition of FSH and LH prevents any further eggs and follicles from developing, while the progesterone is elevated. Biology for AP Courses 2022-06-09T00:00:00Z During the years leading up to menopause, there is a decrease in the levels of the hormone inhibin, which normally participates in a negative feedback loop to the pituitary to control the production of FSH. Anatomy and Physiology 2013-06-19T00:00:00Z The researchers also found that cells with activated FSH receptors tended to cluster at the edges of a tumor. Protein Implicated in Many Cancers 2010-10-21T15:43:00Z Menstruation occurs much before LH and FSH levels peak. Biology for AP Courses 2022-06-09T00:00:00Z Increasing levels of testosterone inhibit the production of GnRH, LH, and FSH by the hypothalamus and pituitary. Biology for AP Courses 2022-06-09T00:00:00Z The decrease in progesterone also allows the hypothalamus to send GnRH to the anterior pituitary, releasing FSH and LH and starting the cycles again. Biology for AP Courses 2022-06-09T00:00:00Z The menopausal decrease in inhibin leads to an increase in FSH. Anatomy and Physiology 2013-06-19T00:00:00Z Ghinea and his colleagues are now trying to confirm in animal studies that the FSH receptor really does contribute to tumor growth. Protein Implicated in Many Cancers 2010-10-21T15:43:00Z LH and FSH stimulate the interstitial cells of Leydig to release testosterone. Biology for AP Courses 2022-06-09T00:00:00Z The stimulation of the anterior pituitary by GnRH triggers the secretion of the hormones LH and FSH. Biology for AP Courses 2022-06-09T00:00:00Z The hypothalamus monitors the need for the FSH and LH hormones made and released from the anterior pituitary. Biology for AP Courses 2022-06-09T00:00:00Z Because small, secondary follicles also respond to increases in FSH levels, larger numbers of follicles are stimulated to grow; however, most undergo atresia and die. Anatomy and Physiology 2013-06-19T00:00:00Z The researchers also want to determine whether compounds that inhibit the receptor or the FSH protein itself might constitute new anticancer drugs. Protein Implicated in Many Cancers 2010-10-21T15:43:00Z After the release of the egg from the follicle, the corpus luteum is formed, which inhibits FSH and LH production, which then inhibits GnRH production, causing no other follicle to develop. Biology for AP Courses 2022-06-09T00:00:00Z After the release of the egg from the follicle, the corpus luteum is formed, which inhibits FSH and LH production, which then inhibits GnRH production, causing no other follicle to develop. Biology for AP Courses 2022-06-09T00:00:00Z FSH and LH affect reproductive structures to cause the formation of sperm and the preparation of eggs for release and possible fertilization. Biology for AP Courses 2022-06-09T00:00:00Z This means that very low concentrations of androgens or estrogens will negatively feed back onto the hypothalamus and pituitary, keeping the production of GnRH, LH, and FSH low. Anatomy and Physiology 2013-06-19T00:00:00Z After the release of the egg from the follicle, the corpus luteum is formed, which inhibits FSH and LH production, which then facilitates GnRH production, causing no other follicle to develop. Biology for AP Courses 2022-06-09T00:00:00Z After the release of the egg from the follicle, the corpus luteum is formed, which inhibits FSH and LH production, which then inhibits GnRH production, causing no other follicle to develop. Biology for AP Courses 2022-06-09T00:00:00Z One follicle, usually the one with the most FSH receptors, survives this period and is now called the dominant follicle. Anatomy and Physiology 2013-06-19T00:00:00Z In females, FSH and LH cause estrogen and progesterone to be produced. Biology for AP Courses 2022-06-09T00:00:00Z The first is a decrease of sensitivity in the hypothalamus and pituitary to negative feedback, meaning that it takes increasingly larger concentrations of sex steroid hormones to stop the production of LH and FSH. Anatomy and Physiology 2013-06-19T00:00:00Z Following a classic negative feedback loop, the high concentrations of estrogen will stimulate the hypothalamus and pituitary to reduce the production of GnRH, LH, and FSH. Anatomy and Physiology 2013-06-19T00:00:00Z Typically only one follicle, now called the dominant follicle, will survive this reduction in FSH, and this follicle will be the one that releases an oocyte. Anatomy and Physiology 2013-06-19T00:00:00Z The positive feedback loop by which more estrogen triggers release of more LH and FSH only occurs at this point in the cycle. Anatomy and Physiology 2013-06-19T00:00:00Z Secretion of pituitary FSH and LH must decrease. Biology for AP Courses 2022-06-09T00:00:00Z The second change in sensitivity is an increase in sensitivity of the gonads to the FSH and LH signals, meaning the gonads of adults are more responsive to gonadotropins than are the gonads of children. Anatomy and Physiology 2013-06-19T00:00:00Z Progesterone triggers negative feedback at the hypothalamus and pituitary, which keeps GnRH, LH, and FSH secretions low, so no new dominant follicles develop at this time. Anatomy and Physiology 2013-06-19T00:00:00Z During this time of reduced progesterone secretion, FSH and LH are once again stimulated, and the follicular phase begins again with a new cohort of early tertiary follicles beginning to grow and secrete estrogen. Anatomy and Physiology 2013-06-19T00:00:00Z In females, FSH promotes egg maturation and LH signals the secretion of the female sex hormones, the estrogens and progesterone. Anatomy and Physiology 2013-06-19T00:00:00Z The hypothalamus releases FSH and LH at puberty by secreting of GnRH. Biology for AP Courses 2022-06-09T00:00:00Z |
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