Biology: Exploring the Living World - part 7 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: Drawing of the skin cells, skin gets cut and bacteria moves in. White blood cells moving toward bacteria. Microscopic view of white blood cell engulfing bacteria cells
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51³Ô¹ÏÍø #:
1454514914
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Rights-ready
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Archive Films: 51³Ô¹ÏÍø
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00:00:32:10
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United States
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QuickTime 10-bit ProRes 422 (HQ) 4K 3840x2160 24p
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