Question

What are Intra-uterine devices (IUDs)? Discuss their mode of action.

Hint:

IUDs are currently the most widely accepted method of contraception in India for women who want to delay pregnancy.

Answer 1

Step 1: IUDs are contraceptive devices inserted by doctors into the uterus through the vagina.
Step 2: They increase the phagocytosis of sperms within the uterus.
Step 3: Specifically, Copper-releasing IUDs (like CuT) release $Cu$ ions that suppress sperm motility, while hormone-releasing IUDs (like LNG-20) make the cervix hostile to sperms.