A) are implanted under the skin and the release progestogen and estrogen
B) act as spermicidal jellies
C) release copper ions in the uterus that increase phagocytosis of sperm
D) block the entry of sperms into vagina.
Correct Answer: C
Solution :
: Intra uterine devices (lUDs) are plastic or metal objects which are inserted by doctors in the uterus through vagina. lUDs increase phagocytosis of sperms within the uterus and the \[Cu\] ions released by some suppress sperm motility and fertilizing capacity of the sperms.
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