How do IUDs prevent pregnancy?

How do IUDs prevent pregnancy? Correct Answer By increasing phagocytosis of sperms

IUDs are intrauterine devices. They do not act as a barrier between vaginal and seminal fluids. Also, they do not affect the ovary or the egg. They work by enhancing the phagocytosis of sperms and thus reducing the probability of sperm entering the fallopian tube to fertilize the egg.
Bissoy MCQ

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Principle: If an injury is the result of a reasonably foreseeable cause, the person/authority responsible is liable for damages because he has a duty to take reasonable measures to prevent it.
Facts: Janet, a housewife standing at her balcony, was struck on the head by a ball that flew out of a cricket field across her home. Janet sues the District Cricket Association (DCA), the owner of the cricket field for public nuisance and negligence on the ground that the field did not have a fence high enough to prevent such occurrence. District Cricket Association (DCA) claims that only about 10 balls had escaped the field in the previous 10 years and it was therefore an unforeseeable risk. Is there a duty on the part of the District Cricket Association (DCA) to prevent the risk? Is the District Cricket Association (DCA) liable to compensate Janet?
With reference to National Rural Health Mission (NRHM), which of the following are the jobs of 'ASHA' a trained community health worker?
1. Accompanying women to the health facility for antenatal care checkup
2. Using pregnancy test kits for early detection of pregnancy
3. Providing information on nutrition and immunization
4. Conducting the delivery of baby
Select the correct answer:
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What are the invasive methods used to prevent pregnancy called?