title: [Action mechanism of IUD. 1].
mesh_terms: D000818:Animals; D002417:Cattle; D010064:Embryo Implantation; D005187:Fallopian Tubes / Q000502:physiology; D005260:Female; D006168:Guinea Pigs; D006801:Humans; D007434:Intrauterine Devices / Q000009:adverse effects; D051379:Mice; D011817:Rabbits; D051381:Rats; D012377:Rodentia; D012756:Sheep; D013552:Swine; D014599:Uterus / Q000502:physiology