A cell is described as having an eccentric heavily stained (condensed chromatin) nucleus with blue cytoplasm. A pale perinuclear Golgi complex is noted next to the nucleus. What is this cell?
a. Myelocyte
b. Plasma cell
c. Lymphocyte
d. Myeloblast
ANS: B
The description fits that of a plasma cell. These are fully differentiated B cells, whose function is to make and secrete specific immunoglobulin (antibody). Because the cytoplasm is rich in ribonucleic acid (RNA) needed for this synthesis, the cytoplasm often stains a brilliant blue.
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