OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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How long can the Intrauterine System (IUS) remain effective?

1-2 years
3-5 years
5-10 years
Indefinitely

The correct answer is: 3-5 years

The Intrauterine System (IUS), which is a form of long-acting reversible contraception, is designed to be effective for a specific time frame. The typical lifespan of the IUS is 3 to 5 years, after which it may need to be replaced to maintain contraceptive efficacy. This time frame allows individuals to enjoy reliable contraception without the need for daily attention or routine visits to a healthcare provider. The IUS works by releasing hormones that thin the uterine lining and inhibit sperm movement, providing effective pregnancy prevention during its effective period. Other options do not accurately reflect the functionality of the IUS; while it can be quite effective for longer durations, it isn't designed to last indefinitely, nor is its effectiveness limited to just 1 or 2 years. Therefore, the timeframe of 3 to 5 years is the most accurate representation of how long the Intrauterine System can remain effective.