An Introduction to the Immune System

The video, presented by Leslie Samuel, provides an overview of the immune system, explaining its complexity and function in protecting the body from harmful substances. It describes the three lines of defense: physical and chemical barriers, the innate immune response, and the adaptive immune response. The first line includes skin, saliva, and mucous membranes, while the second involves phagocytes and the complement system. The third line focuses on B and T cells, detailing humoral and cell-mediated immunity. The video emphasizes the importance of these defenses in maintaining health.

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