What is the primary function of haemoglobin in the body?

Haemoglobin's primary function is to carry oxygen from the lungs to the tissues throughout the body. This protein, found in red blood cells, binds to oxygen molecules when blood passes through the lungs, where oxygen concentration is high. Once the blood reaches tissues with lower oxygen levels, haemoglobin releases the oxygen, making it available for cellular processes.

While haemoglobin does play a minor role in the transport of carbon dioxide back to the lungs, its main purpose is specifically oxygen transport. Furthermore, haemoglobin does not have any direct regulation of blood pressure nor is it involved in the transportation of nutrients. Its essential role in oxygen delivery is crucial for maintaining life, as oxygen is required for cellular respiration, which produces the energy that powers bodily functions.