When an IUD in a human uterus, the immune system registers it as an intruder and starts to attack and end up killing the majority of sperm that reach the uterus.
Mgbe onu ogugu nke insulin n'ime obara di n'ime obara, aru ahu na-achota ihe a dika ihe di egwu ma malite ibukota atumatu ahihia dika o buru.