Question

The contraceptive “Copper-T” prevents pregnancy by:

• A. Preventing ovulation
• B. Killing sperms in acidic medium
• C. Increasing phagocytosis of sperms
• D. Blocking implantation only

Hint:

While it also makes the uterus unsuitable for implantation, its primary action is reducing the number and activity of sperms before they even reach the egg.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Intrauterine Devices (IUDs) like Copper-T are inserted into the uterus to provide long-term contraception by altering the uterine environment.

Step 2: Key Formula or Approach:
Copper ions released from the device act as a spermicide.

Step 3: Detailed Explanation:
Copper-T works primarily by releasing copper ions ($Cu^{2+}$) into the uterine fluid. These ions are toxic to sperm; they suppress sperm motility (movement) and their ability to fertilize the egg. Crucially, the presence of the device triggers an inflammatory response in the uterus, which leads to the increased phagocytosis (destruction) of sperms by white blood cells.

Step 4: Final Answer:
Copper-T prevents pregnancy primarily by increasing the phagocytosis of sperms within the uterus.