Which ions are released by the IUDs so that they become toxic for the sperm?

Options

A. Iron
B. Cobalt
C. Copper
D. Magnesium

Answer

To solve the question "Which ions are released by the IUDs so that they become toxic for the sperm?", we can follow these steps:

### Step 1: Understand what IUDs are
IUD stands for Intrauterine Device, which is a form of contraception. It is placed inside the uterus to prevent pregnancy.

**Hint:** Remember that IUDs are used for birth control and can have different mechanisms of action.

### Step 2: Identify the materials used in IUDs
Most IUDs are made of plastic and may contain metal components. The most common type of IUD is the copper IUD, which has a plastic frame wrapped with copper wire.

**Hint:** Focus on the materials that are specifically mentioned in relation to IUDs.

### Step 3: Understand how IUDs work
IUDs work primarily by damaging sperm and disrupting their motility, which prevents them from reaching and fertilizing an egg. The copper ions released from the IUD play a significant role in this process.

**Hint:** Consider how the presence of certain ions can affect sperm function.

### Step 4: Identify the specific ions released
Copper ions are released by copper IUDs. These ions are toxic to sperm, increasing their mortality and inhibiting their ability to move effectively through the cervical mucus.

**Hint:** Think about which ions are known to have a spermicide effect.

### Step 5: Choose the correct answer
Based on the information gathered, the ions released by IUDs that become toxic for sperm are copper ions.

**Final Answer:** The correct answer is **copper** (option number 3).