Question

The hormone releasing intra uterine devices such as Progestasert specifically

• A. Suppress sperm motility
• B. Make uterus unsuitable for implantation
• C. Suppress fertilizing capacity of sperms
• D. Increase phagocytosis of sperms

Answer 1

The correct option is B

Make uterus unsuitable for implantation

Hormone releasing IUDs :
Hormone-releasing IUDs are those intra uterine devices which make the cervix hostile by making the cervical mucus thick and sticky due to which sperm are not able to reach the uterus.
They also change the environment of the uterus making it unsuitable for implantation of the embryo.
Examples: LNG$-20$ and progestasert.

Copper releasing IUDs :
Copper releasing IUDs release copper ions into the uterus where it suppresses the motility of the sperms so that they cannot swim and reach the fallopian tube for fertilisation. Copper ions also reduce the fertilising capacity of the sperm and increase their phagocytosis within the uterus. Examples include CuT, Cu7, Multiload $375$.

Final Answer:
(c) Make uterus unsuitable for implantation