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Lesson 1.5 – So why aren’t we always sick? Our body’s defenses

We are covered in bacteria and exposed to viruses all the time, but we rarely get sick. Why? Students will develop their understanding of sterility and the notion that the interior of the body is sterile while the exterior is non-sterile. This will involve a new concept: the outside of the body includes all areas that contact the environment, including the intestinal lumen. Based on these ideas, students will then identify host barriers designed to protect against infection.

Teacher Prep

1.5 Classroom Materials

1.5 Alternative Approaches

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