Immune System, part 1: Crash Course A&P

The video explains the human immune system, focusing on the innate immune system's role in defending against pathogens. It describes physical barriers like skin and mucous membranes, and internal defenses such as phagocytes and natural killer cells. The inflammatory response and fever are highlighted as key defense mechanisms. The video concludes with a brief mention of adaptive immunity, setting the stage for further exploration in future episodes.

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