Why target cells are formed?


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Why target cells are formed?

Codocytes also known as target cells are red blood cells that have the appearance of a shooting target with a bullseye. In optical microscopy these cells appear to have a dark center (a central, hemoglobinized area) surrounded by a white ring (an area of relative pallor), followed by dark outer (peripheral) second ring containing a band of hemoglobin. However, in electron microscopy they appear very thin and bell shaped (hence the name codo-: bell).
Reasons behind :
These cells are characterized by a disproportional increase in the ratio of surface membrane area to volume. This is also described as a “relative membrane excess.” It is due to either increased red cell surface area (increased beyond normal), or else a decreased intracellular hemoglobin content (which may cause an abnormal decrease in cell volume without affecting the amount of membrane area).
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