The absence of a nucleus and light effect makes the central part of a red blood cell appear paler
The red blood cells ( RBC )does not have a nuclei like every other cells contained in the body. therefore when viewed under a light microscope the outside of the red blood cell will appear brighter ( pink ) while the center of the red blood cell will appear pale ( whitish ). also the the light intensity from the light microscope contributes to the pale nature of the central part of the red blood cell.
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