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Immune System

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The immune system comprises the tissues, organs, and substances in the body that protect it from pathogens, allergens, and other foreign bodies. For instance, the primary function of white blood cells, or leukocytes, is to identify and destroy harmful antigens that enter the body. Once the white blood cells encounter an antigen, they are stimulated to divide and produce specialized cells to kill the substance. When the white blood cells determine how to destroy the bacteria, they create memory cells to handle future attacks of the same bacteria.

Duration: 00:39

Published: 11/25/2015

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