Number Present


Red blood cell (erythrocyte)

Biconcave disk without a nucleus, about one-third hemoglobin

4,200,000 to

6,200,000 per mm3

Transports oxygen and carbon dioxide

White blood cell (leukocyte)


About twice the size of red blood cells; cytoplasmic granules are present

5,000 to 10,000 per mm3

Destroys pathogenic microorganisms and parasites and removes worn cells

1. Neutrophil

Nucleus with two to five lobes; cytoplasmic granules stain light purple in combined acid and base stains

54%-62% of white blood cells present

Phagocytizes small particles

2. Eosinophil

Nucleus bilobed; cytoplasmic granules stain red in acid stain

1%-3% of white blood cells present

Kills parasites and helps control inflammation and allergic reaction

3. Basophil

Nucleus lobed; cytoplasmic granules stain blue in basic stain

Less than 1% of white blood cells present

Releases heparin and histamine


Cytoplasmic granules are absent

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