In human beings, the respiratory pigment that carries oxygen is ______.
haemoglobin
Haemoglobin is an iron-containing protein present inside red blood cells (erythrocytes). Each haemoglobin molecule has four haem groups, and each haem holds one Fe2+ ion that reversibly binds one O2 molecule.
In the lungs, where oxygen partial pressure is high, haemoglobin picks up oxygen to form oxyhaemoglobin; at the tissues, where oxygen is low and CO2 is high, it releases oxygen for cellular respiration.
Insulin is a pancreatic hormone that regulates blood glucose, myosin is a contractile protein in muscle fibres, and chlorophyll is the green photosynthetic pigment found in plants - none of them transports oxygen in humans.
Hence, the respiratory pigment that carries oxygen in human beings is haemoglobin.
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