2006-10-14 10:42:48 · 7 answers · asked by Lelani D 1 in Science & Mathematics ➔ Biology
It's definitely oestrogen that builds up the endometrial lining. Progesterone only helps to support it when progesterone rises in level after ovulation.
2006-10-14 13:09:55 · answer #1 · answered by tort_oise 1 · 0⤊ 0⤋
Gonadatropin releasting hormone (GnRH) is released from the anterior hypothalamus into the circulation, as well as stimulating Lutenizing Hormone (LH)and Folicle Stimulating Hormone (FSH) to be released into the circulation from the pituitary. These hormones have direct effects on the sex organs in both men and women, and are key contributors to the Hypothalamic-Pituitary-Gonadal axis (HPG axis). They are regulated through negative feedback, and are necessary for sexual displays, especially in lower mammals. There is another positive feedback loop, specific to females, that begins with the increase of estrogen triggering spikes in the release of GnRH, which in turn leads to the release of more LH/FSH, thus stimulating the gonads to increase the production of more estrogen (this is the positive loop) as well as releasing the ovum and prepaing the uterus for a two week "psuedopregnancy" common to primates, which terminates with the flushing of unused tissue and blood after no fertilization takes place. This psuedopregnancy is not seen in all mammals. Mice and rats, for instance, must have cervical stimulation in order to observe uterian wall pregnancy preperation.
2006-10-14 20:37:23 · answer #2 · answered by u_maine_black_bear 2 · 1⤊ 0⤋
Just Progesterone.
The word "progesterone" itself describes the function of the hormone:
PRO - "supporting"
GEST - "gestation" (pregnancy)
ER "ester"
ONE - hormone
2006-10-14 17:53:59 · answer #3 · answered by ? 5 · 0⤊ 0⤋
estrogen? i think that would be it...b/c a new lining in the uterus leads to your period (when the lining builds up too much), and periods only happen in women, and estrogen is the main hormone in sexual development in women. so my guess would be estrogen.
2006-10-14 17:45:41 · answer #4 · answered by mighty_power7 7 · 2⤊ 2⤋
Estrogen.
2006-10-14 17:48:06 · answer #5 · answered by retorik75 5 · 0⤊ 1⤋
progesterone. it cycles and when you have less of it (1st week of the month) the lining sheds and you have a period
2006-10-14 17:51:49 · answer #6 · answered by laura w 3 · 0⤊ 0⤋
progesterone and oestrogen
2006-10-14 17:49:31 · answer #7 · answered by monkey luv... 2 · 0⤊ 1⤋