The function of copper ions in copper releasing IUDs is

Options

A. They increase phagocytosis of sperm within the uterus.
B. They suppress sperm motility and the fertilising capacity of sperms.
C. They make the uterus unsuitable for implantation
D. They inhibit ovuluation

Answer

**Step-by-Step Solution:**

1. **Understanding IUDs**: Begin by defining what an IUD (Intrauterine Device) is. IUDs are small devices inserted into the uterus to prevent pregnancy. They are a popular and effective method of birth control.

2. **Types of IUDs**: Identify the types of IUDs available. There are two main types: copper-coated IUDs and hormone-releasing IUDs. Copper-coated IUDs are often referred to as "copper T".

3. **Function of Copper Ions**: Focus on the specific function of copper ions in copper-releasing IUDs. Copper ions are released into the uterus and play a significant role in preventing fertilization.

4. **Mechanism of Action**: Explain how copper ions affect sperm. They suppress sperm motility, which means they hinder the movement of sperm, making it difficult for them to reach and fertilize an egg. Additionally, they reduce the fertilizing capacity of the sperm.

5. **Evaluating Options**: Review the options provided in the question:
- Option 1: Increase phagocytosis of the sperm within the uterus.
- Option 2: Suppress sperm motility and the fertilizing capacity of the sperms.
- Option 3: Make the uterus unsuitable for implantation.
- Option 4: Inhibit ovulation.

6. **Selecting the Correct Answer**: Based on the information gathered, the correct answer is Option 2: "They suppress sperm motility and the fertilizing capacity of the sperms."