How does a levonorgestrel-releasing intrauterine system mainly prevent pregnancy?
Correct answer: B. It thickens cervical mucus and changes the endometrium
- A. It releases estrogen to stop all menstrual bleeding
- B. It thickens cervical mucus and changes the endometrium
- C. It blocks both fallopian tubes permanently
- D. It destroys sperm throughout the entire bloodstream
Explanation
The levonorgestrel intrauterine system releases a progestin that thickens cervical mucus and makes the endometrium unsuitable for implantation, with some suppression of ovulation in some users. It does not permanently block the tubes or release estrogen.
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Family planning covers fertility awareness, lactational amenorrhoea, condoms, oral pills, injectables, implants, intrauterine devices, emergency contraception, sterilisation and postpartum options. Questions address mechanisms, effectiveness, contraindications, adverse effects, counselling and follow-up, with careful distinction between contraception, emergency contraception and treatment for infertility.
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