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 within red blood cells that binds to oxygen. When oxygen enters the lungs, it diffuses into the bloodstream and attaches to iron in hemoglobin. Each hemoglobin molecule can carry up to four oxygen molecules, making iron essential for ensuring that the body's tissues receive adequate oxygen for metabolism and various physiological functions.

The significance of iron in this context is underscored by its role in preventing anemia, a condition characterized by insufficient healthy red blood cells to adequately transport oxygen. Anemia can lead to fatigue and weakness due to reduced oxygen availability to the body's organs and tissues.

In contrast, while calcium, magnesium, and sodium play important roles in various bodily functions, they do not have the primary function of oxygen transport. Calcium is primarily involved in bone health and muscle function, magnesium contributes to numerous biochemical reactions and energy production, and sodium is crucial for fluid balance and nerve signaling.