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Emma Lloyd -
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Guide to Immune Cells - Function and Physiology
Immune cells exist in two forms—leukocytes and phagocytes. Leukocytes are better known as white blood cells. They are white because they lack hemoglobin. Leukocytes come in two forms—phagocytes (including granulocytes, macrophages and dendritic cells) —and lymphocytes (B and T cells). There are two types of T cells—helper T and killer T cells. Phagocytes consume foreign particles. Granulocytes “nibble” intruders. Macrophages and dendritic cells, slower to respond, surround and devour them. Lymphocyte B and T cells behave differently. Although they can sometimes destroy bacteria, they are especially adept at destroying viruses. Want to learn more? Consider topical articles by your Bright Hub contributors.
Image Credit: Two Varieties of Immune Cell; National Cancer Institute
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