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

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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