Which mineral is crucial for oxygen transport in the blood?

Iron is essential for oxygen transport in the blood because it is a key component of hemoglobin, the protein in red blood cells responsible for carrying oxygen from the lungs to the tissues throughout the body. Each hemoglobin molecule can bind up to four oxygen molecules, facilitating their transport and release where needed. Without sufficient iron, the production of hemoglobin can be compromised, leading to iron deficiency anemia. This condition results in decreased oxygen delivery to the body's cells, which can cause fatigue and other health issues.

While calcium, zinc, and magnesium are important minerals for various bodily functions, they do not play a direct role in the transport of oxygen. Calcium is primarily involved in bone health and muscle function, zinc supports immune function and protein synthesis, and magnesium is critical for energy production and muscle relaxation. These roles are vital for overall health but are separate from the specific function of iron in oxygen transport.