Norethindrone blockade of pituitary gonadotropin release; counteraction by estrogen.
D000818:Animals; D003307:Copulation; D004967:Estrogens / Q000494:pharmacology*; D004971:Estrus; D005260:Female; D006065:Gonadotropins, Pituitary / Q000378:metabolism*; D008297:Male; D009640:Norethindrone / Q000494:pharmacology*; D010053:Ovary / Q000502:physiology; D010060:Ovulation / Q000187:drug effects*; D010902:Pituitary Gland; D011247:Pregnancy; D011372:Progestins / Q000378:metabolism; D011817:Rabbits
D004967:Estrogens; D006065:Gonadotropins, Pituitary; D011372:Progestins; D009640:Norethindrone