Hormone releasing IUD"s make the uterus unsuitable for implantation?
How they does this, do they release artificial hormones or signal brain?


I am uanble to understand the concept behind this?

Dear student, 
Please find below the solution to the asked query        

Hormone releasing intra uterine devices are those devices which release certain hormones that alter the hormonal balance in the female body and prevent the conception. They are also known as medicated intra uterine devices. These devices inhibit ovulation, implantation and slow down the growth of sperms avoiding the chances of conception.
Hormone releasing IUDs release two hormones namely progestin and levonorgestrel. They cause phagocytosis of sperms and can prevent pregnancy for many years.
For example- Progestasert, LNG-20 etc

Hope this information will clear your doubts about the topic.   
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