在一些啮齿动物中,松弛素是一种在体内外均能抑制子宫肌层收缩的肽类激素,已证明有降低离体人类子宫肌层自然收缩幅度的作用.在妇女,松弛素是妊娠黄体的产物.最初由发育中胚囊分泌的HCG刺激,使月经周期的黄体继续发育为妊娠黄体,增加了孕激素的分泌,并将松弛索分泌进入外周血清.在妊娠期间,早在预计经期过期未至时,松弛素即在血清中出现.因为松弛素和孕激素都能抑制子宫收缩,而且二者都是早期妊娠黄体的产物,本研究是检查这些作用能否协同地维持子宫静止状态. In some rodents, relaxin is a peptide hormone that inhibits contraction of the myometrium both in vitro and in vivo and has been shown to reduce the natural contractility of the isolated myometrium. In women, relaxin is a member of the corpus luteum The initial HCG stimulation by the developing midgut triggers the luteal phase of the menstrual cycle to develop into the corpus luteum, increases the secretion of progesterone, and secretes the laxation line into the peripheral blood serum. As early as the expected expiration of menstruation during pregnancy, In the absence of relaxin, which is found in serum, relaxin and progestin suppress both uterine contractions, and both are products of early pregnancy corpus luteum, and this study examined whether these effects could synergistically maintain the resting state of the uterus.