Which mechanism is primarily responsible for Mirena's contraceptive effect?

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Multiple Choice

Which mechanism is primarily responsible for Mirena's contraceptive effect?

Explanation:
Mirena works mainly by thickening the cervical mucus. The levonorgestrel released by the device makes the mucus in the cervix very thick, creating a strong barrier that hinders sperm from entering the uterus and reaching an egg, which greatly lowers the chance of fertilization. While additional effects such as thin endometrium and, in some cycles, reduced ovulation can occur, these are secondary to the mucus barrier. The other options describe actions that aren’t the primary mechanism of Mirena, such as thickening the endometrium, completely blocking ovulation, or inducing abortion.

Mirena works mainly by thickening the cervical mucus. The levonorgestrel released by the device makes the mucus in the cervix very thick, creating a strong barrier that hinders sperm from entering the uterus and reaching an egg, which greatly lowers the chance of fertilization. While additional effects such as thin endometrium and, in some cycles, reduced ovulation can occur, these are secondary to the mucus barrier. The other options describe actions that aren’t the primary mechanism of Mirena, such as thickening the endometrium, completely blocking ovulation, or inducing abortion.

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