Why is iron important for the body?

Iron plays a crucial role in the body, particularly in the formation of haemoglobin, which is a key component of red blood cells. Haemoglobin is responsible for transporting oxygen from the lungs to the tissues and organs throughout the body. Along with this, it helps in the removal of carbon dioxide, a waste product generated by metabolism, from the body. Without adequate iron, the production of haemoglobin can be impaired, leading to conditions such as iron-deficiency anemia. This condition results in reduced oxygen delivery, which can cause fatigue, weakness, and other symptoms.

While other options mention important functions in the body, they do not directly relate to iron's specific role. For instance, vitamin C is crucial for tissue growth and repair, but it does not rely on iron for its formation. Similarly, energy production in muscles primarily involves nutrients such as carbohydrates and fats, while the functioning of the nervous system relies on nutrients like B vitamins and omega-3 fatty acids. Thus, the importance of iron is most accurately encapsulated by its role in making haemoglobin in red blood cells.