Hémoglobine is a protein found in red blood cells that plays a crucial role in transporting oxygen from the lungs to the rest of the body. It binds to oxygen molecules, allowing them to be carried through the bloodstream. Each molecule of hémoglobine can carry up to four oxygen molecules, making it essential for maintaining the body's energy levels. In addition to oxygen transport, hémoglobine also helps in carrying carbon dioxide, a waste product, back to the lungs for exhalation. The levels of hémoglobine in the blood can be measured to assess a person's overall health, as low levels may indicate conditions like anemia.