How do copper and hormone releasing IUDs act as contraceptives? Explain.

Explanation

**Step-by-Step Solution:**

1. **Definition of IUDs**:
- Intrauterine devices (IUDs) are small, T-shaped devices that are inserted into the uterus to prevent pregnancy.

2. **Mechanism of Copper-Releasing IUDs**:
- Copper-releasing IUDs release copper ions into the uterus.
- These copper ions have a toxic effect on sperm, which suppresses sperm motility (the ability of sperm to move effectively).
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