The endometrium changes throughout the menstrual cycle in response to hormones. During the first part of the cycle, the hormone estrogen is made by the ovaries. Estrogen causes the lining to grow and thicken to prepare the uterus for pregnancy. In the middle of the cycle, an egg is released from one of the ovaries (ovulation). Following ovulation, levels of ...
GnRH is found in very low concentrations (2-10 pg/mL)
A highly sensitive analytical method (e.g. radioimmunoassay)
To sample directly from the hypophyseal-portal system
A surrogate measure
This abstract: http://www.ncbi.nlm.nih.gov/pubmed/9749566 describes direct measurement.
Direct sampling could only be done under general ...
I find FSH and LH hormones do actually
decrease during day 4-14. Is that because of increase of
You first need to note that during one ovarian cycle, multiple follicles are stimulated to grow at the same time by FSH. However, one follicle ends up being the dominant follicle, and it is the oocyte housed within this follicle that is released on ...
My (honest) opinion, don't pay too much attention on the graph. While looking at other graphs on the internet, I found that many graphs show different levels of hormones on the same day. See these two images (upper one from here and lower one from here) for example:
See the level of FSH and LH on same day in both graphs, you'll find difference. In short, ...
Some graphs about the ovarian cycle mention only the follicular phase and luteal phase, and the ovulation just as a point in time, not a phase, for example, here:
In this case, the LH surge starts in the follicular phase and peaks at ovulation or shortly before it.
Some other graphs also show the "periovulatory" phase (or "...
According to this article polar bodies sometimes apoptose but sometimes are "capable of developing into complex, highly organized structures, or even enabling parthenogenesis". Despite their fate being far less than the oocyte.
It also states they're present not only in other animals, but also some plants.
"In other animals and some plants, polar bodies ...
Luteinizing hormone (LH): A hormone released by the pituitary gland in response to luteinizing hormone- releasing hormone. It controls the length and sequence of the female menstrual cycle, including ovulation, preparation of the uterus for implantation of a fertilized egg, and ovarian production of both estrogen and progesterone. Theca cells in the ovary ...
TSH has an effect slightly similar to that of FSH and LH. This is found to be problematic in thyroid diorders. For example, in hypothyroidism the TSH overflow causes children to become fertile at an earlier stage, compared to the norm .
 Ann N Y Acad Sci. 1997 Jun 17;816:280-4. PMID: 9238278. http://www.ncbi.nlm.nih.gov/pubmed/9238278