(B) Haemoglobin $(Hb)$ is an iron-containing,deep red-coloured respiratory pigment found in red blood cells.It plays a crucial role in the transport o

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(B) Haemoglobin $(Hb)$ is an iron-containing,deep red-coloured respiratory pigment found in red blood cells.It plays a crucial role in the transport of oxygen from the lungs to the tissues and carbon dioxide from the tissues back to the lungs.When it combines with oxygen,it forms oxyhaemoglobin,which gives it a bright red colour.