Biology: Exploring the Living World - part 15 of 18. Examines the three lines of defense against infection - the skin and mucous membrane, the lymphatic system, and the circulatory system including liver and spleen. Explains how the body becomes immune to - 4K stock video

1940s: Scientist adding chemical to microscope slide. Typhoid bacteria sticking together in clumps. Bacteria being engulfed by phagocyte
1940s: Scientist adding chemical to microscope slide. Typhoid bacteria sticking together in clumps. Bacteria being engulfed by phagocyte
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Creative #:
1454516069
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Archive Films: Creative
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00:00:33:13
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