Haemoglobin Holds High Oxygen Affinity
In humans, Haemoglobin is the protein molecule primarily responsible for oxygen transport. Located within red blood cells, it readily binds to oxygen in the lungs where oxygen concentration is high and releases it in tissues where oxygen concentration is lower.
Comparing Other Options
- Carbon dioxide: While haemoglobin also transports some carbon dioxide, its affinity for CO₂ is much lower than for oxygen under typical physiological conditions.
- White blood cells: These cells are part of the immune system and do not play a role in oxygen transport or binding.
- Melanin: This pigment provides color to skin, hair, and eyes and has no function related to oxygen binding.
Therefore, Haemoglobin is the correct answer due to its specific and high affinity for oxygen.
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