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甾体避孕药是通过丘脑和垂体的作用抑制排卵,改变子宫颈粘液的粘稠度,阻止精子穿过,改变受精卵在输卵管内的运行速度,改变子宫内膜,使之不利于孕卵着床,从而达到避孕的目的。
Steroidal contraceptives through the role of the hypothalamus and pituitary inhibit ovulation, changing the viscosity of cervical mucus to prevent sperm from passing through, to change the fertilized egg in the fallopian tube speed, change the endometrium, so that it is not conducive to the pregnancy egg Bed, so as to achieve the purpose of contraception.