The function of copper ions in copper releasing IUD's is

Options

A. they suppress sperm motility and fertllisling capacity of sperms
B. they inhinit gametogenesis
C. they make uterus unsuitable for implantation
D. they inhibit ovulation

Answer

### Step-by-Step Solution:

1. **Understanding IUDs**:
- An Intrauterine Device (IUD) is a form of contraceptive that is inserted into the uterus to prevent pregnancy. It acts as a mechanical barrier to block sperm from reaching the egg.

2. **Role of Copper Ions**:
- Some IUDs are designed to release copper ions (Cu²⁺) into the uterus. These copper ions play a crucial role in enhancing the contraceptive effect of the device.

3. **Mechanism of Action**:
- The copper ions released from the IUD interact with the sperm. Specifically, they affect the sperm's motility, which is the ability of sperm to move effectively.

4. **Impact on Sperm Motility**:
- Copper ions react with the lipids present in the plasma membrane of the sperm. This reaction alters the configuration of the lipids, which is essential for the sperm's movement.

5. **Resulting Effect**:
- As a result of the interaction between copper ions and the sperm membrane, the motility of the sperm is reduced. This means that the sperm cannot swim effectively towards the egg, thereby decreasing the chances of fertilization.

6. **Conclusion**:
- The primary function of copper ions in copper-releasing IUDs is to suppress sperm motility and reduce the fertilizing capacity of sperm, thus preventing pregnancy.