Draw students' attention to the key ideas using means such as posters or overhead transparencies.
Assign the Mini Activity: Homeostasis and have students discuss homeostasis as it relates to the respiratory system.
Discuss the importance of negative feedback and how it allows the respiratory system to adapt to changing conditions.
Select appropriate Enrichment activities, Groupwork activities, and Projects, as time permits.
Throughout and at the end of the section refocus students' attention on the key ideas.
Homeostasis Students define homeostasis and relate homeostasis to feedback. See TE background-Activity 4.1: How Does a Controller Work?
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Your breathing control systems use negative feedback. Can you think of any other negative feedback systems in your body?