Metal ion transport refers to the movement of metal ions, such as iron, copper, and zinc, across cell membranes. This process is essential for various biological functions, including enzyme activity, oxygen transport, and cellular signaling. Specialized proteins, known as transporters or channels, facilitate the uptake and release of these ions, ensuring that cells maintain the right balance for optimal functioning. In living organisms, metal ion transport is tightly regulated to prevent toxicity and deficiency. For example, metalloproteins play a crucial role in binding and transporting metal ions within cells. Disruptions in metal ion transport can lead to health issues, such as anemia or Wilson's disease.