CH. 21 DISEASES OF THE RESPIRATORY TRACT

Organs of the lymphatic system - help defend against disease (Fig 22.1) red bone marrow. thymus. lymph nodes . spleen. mucosa-associated lymphoid tissue (MALT) Lymphatic cells and chemicals. white blood cells. cytokines - small cell-signaling protein molecules that are secreted by numerous cells and regulate immune system function. Lymphatic ... ................
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