What is the main hormone contained in the Mirena IUD?

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Multiple Choice

What is the main hormone contained in the Mirena IUD?

Explanation:
Levonorgestrel—the Mirena intrauterine system releases this synthetic progestin. It acts mainly in the uterus to thicken cervical mucus and thin the endometrium, creating a hostile environment for sperm and reducing the likelihood of implantation, which provides contraception. The other substances are different hormones: ethynyl estradiol is an estrogen used in combined birth control pills, norethindrone is another progestin but not the one used in Mirena, and natural progesterone is not the compound delivered by this device.

Levonorgestrel—the Mirena intrauterine system releases this synthetic progestin. It acts mainly in the uterus to thicken cervical mucus and thin the endometrium, creating a hostile environment for sperm and reducing the likelihood of implantation, which provides contraception. The other substances are different hormones: ethynyl estradiol is an estrogen used in combined birth control pills, norethindrone is another progestin but not the one used in Mirena, and natural progesterone is not the compound delivered by this device.

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