Discussion
The life span of erythrocytes is :
Answer: B
The life span of erythrocytes is 120 days.
Red blood cells have no nucleus and cannot repair themselves. After about 120 days in circulation they become fragile and are removed by macrophages, mainly in the spleen and liver, where their haemoglobin is broken down into bilirubin and recycled iron.
160, 140 and 180 days are all longer than the normal red cell life span. By contrast, platelets survive about 7 to 10 days and many white cells only hours to days.
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