What is the function of hemoglobin in red blood cells?

Hemoglobin plays a crucial role in the function of red blood cells primarily by transporting oxygen from the lungs to the tissues throughout the body. This protein molecule binds to oxygen when red blood cells pass through the lung capillaries, where oxygen concentration is high. Once it reaches the tissues, hemoglobin releases the oxygen, which is then utilized by cells for metabolism and energy production.

While hemoglobin is also involved in the transport of carbon dioxide, its primary function is to carry oxygen. Storing iron is not a function of hemoglobin itself; rather, iron is a vital component of hemoglobin. Additionally, hemoglobin does not directly regulate blood pressure, although oxygen transport can influence overall cardiovascular health. Understanding hemoglobin's role is fundamental in physiology and highlights how essential oxygen delivery is for cellular function and overall health.