松驰素主要由孕期卵巢的黄体分泌，具有抑制子宫肌壁的自发性收缩，松弛子宫颈，拉长耻骨间韧带的作用。所以，传统认为松驰素是一种孕期激素。近年来，由于合成和重组松驰素的研制成功，促进了极驰素的生理和药理研究。人们发现：不仅卵巢分泌松弛素，许多其他组织，如胎盘、 Relaxin mainly by the ovarian progesterone during pregnancy, with inhibition of spontaneous contraction of the uterine muscle wall, relax the cervix, the role of the elongated pubis intervertebral ligament. Therefore, the traditional think loose-relaxation hormone is a pregnancy hormone. In recent years, due to the successful development of synthetic and recombinant relaxin, it promotes the physiological and pharmacological studies of polar chemicals. It was found that not only does ovarian secretion of relaxin, many other tissues such as placenta,