Oxygen is transported in human blood mainly by binding with the pigment __________.
Haemoglobin
Red blood cells contain a red-coloured, iron-containing protein pigment called haemoglobin. When blood passes through the lungs, oxygen binds loosely to the iron atoms of haemoglobin to form oxyhaemoglobin, and this oxygen is released to body tissues where it is needed. Nearly all the oxygen carried by blood is transported this way.
Myoglobin does bind oxygen, but it is found in muscle tissue where it stores oxygen locally; it does not transport oxygen through the blood. Chlorophyll is the green pigment in plants that captures light energy for photosynthesis; it has no role in animal blood. Plasma is the pale yellow liquid part of blood that carries dissolved salts, proteins and a small amount of dissolved oxygen, but the bulk oxygen transport is done by haemoglobin.
Hence, the answer is Haemoglobin.
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