Which mineral is crucial for oxygen transport in the blood?

Iron is crucial 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. Hemoglobin contains iron atoms that can bind to oxygen molecules, enabling efficient transport. Without sufficient iron, the body cannot produce enough healthy hemoglobin, which can lead to reduced oxygen delivery and anemia.

Calcium primarily plays a role in bone health and muscle function, while sodium and potassium are critical for maintaining cellular function and fluid balance. However, they do not have a direct role in oxygen transport like iron. Thus, iron stands out as the essential mineral in the process of oxygen transportation in the bloodstream.