The immune system consists of peripheral
blood lymphocytes and of the lymphatic organs
(lymphoid tissue). The primary lymphoid tissues
are the thymus and bone marrow. Secondary
lymphoid tissues are the lymph nodes in
various regions of the body, especially the nasopharynx,
axillae, groins, and intestines. The
spleen is considered a secondary lymphatic
organ.
Sunday, April 12, 2009
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