In which cell is the respiratory pigment haemoglobin found in humans?
Red blood cells
The question asks which human cell contains the respiratory pigment haemoglobin.
The correct answer is red blood cells (erythrocytes).
Haemoglobin is an iron-containing protein that binds oxygen in the lungs and carries it to the body's tissues, and also helps transport carbon dioxide back.
Its iron content gives red blood cells, and therefore blood, its characteristic red colour.
Blood platelets are cell fragments involved in clotting and do not carry haemoglobin.
Monocytes are white blood cells that fight infection, and nerve cells transmit impulses, so none of these carry the respiratory pigment.
Hence the respiratory pigment haemoglobin is found in Red blood cells.
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