What role does haemoglobin play in the body?

Haemoglobin plays a crucial role in the body's respiratory system by transporting oxygen from the lungs to the tissues and organs, which is essential for cellular respiration and energy production. This protein, found in red blood cells, binds to oxygen molecules, thereby increasing the blood's capacity to carry oxygen. Once it reaches the tissues, haemoglobin releases the oxygen, allowing cells to utilize it for metabolic processes. This function is vital for maintaining the body’s energy levels and overall homeostasis.

In contrast, while haemoglobin does interact with carbon dioxide, its primary role is not limited to transporting it; rather, it is much more focused on oxygen transport. Moreover, it does not play a direct role in muscle contraction or regulating body temperature. These functions are attributed to other physiological mechanisms and proteins in the body.