2) leukocyte --a group of large cells with nucleus involve in defense and immune reaction normal number:(4.0-10)X109/L classification granulocytes: /neutrophil /eosinophil /basophil ● agranulocytes /lympocyte /monocyte2) leukocyte ---a group of large cells with nucleus ---involve in defense and immune reaction ---normal number: (4.0-10) X109 /L ---classification: granulocytes: /neutrophil /eosinophil /basophil agranulocytes: /lympocyte /monocyte