DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Implantation of an IUD contraceptive. Close-up view, through vaginal expanders, of the cervix, the neck of the uterus, during implantation of an intrauterine device (IUD). This IUD, made by Mirena, is a T-shaped piece of plastic that releases low doses of progesterone. It is inserted in the uterus (womb) to prevent pregnancy. The presence of the device and the addition of the female sex hormone progesterone, both help prevent a fertilised egg implanting in the uterine wall. The progesterone is released for up to 5 years, after which the device is removed.
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