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Which structures are chemical barriers? Which structures provide both physical and chemical barriers? Application: that works? Having a runny nose (and blowing your nose) protects your body from pathogens. How do you think Why do cells that line the respiratory tract (including the nose and lungs) have cilia? How does this help prevent an infection? Part 2. Specific defenses - Body Structures In addition to the models in the lab, your book and notes, go to https://www.biointeractive.org/classroom-resources/immune-system and use the interactive to help you answer these questions. In the diagram below label and give the function of the tonsils, bone marrow, lymph nodes, spleen and thymus. A color diagram of this figure will be available in the lab. O 76