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    NSBRI
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    In this activity (on page 146 of the PDF), learners will explore the effects of increased carbon dioxide in the bloodstream. This activity can be enhanced by sharing the "Astronaut's...

    1 cent - $1 per group Ages 8 - 18 45 to 60 minutes
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    Science Museum of Minnesota
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    Learners will determine their respiratory rate and explore the factors that affect breathing rate by filling out and using the Respiratory Chart provided in the lesson. Useful information about...

    free Ages 6 - 14 10 to 30 minutes
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    NSBRI
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    In this activity about the baroreceptor reflex (BR) arc (page 123 of the PDF), learners discover the importance of maintaining adequate arterial blood pressure through a role playing exercise. This...

    1 cent - $1 per group Ages 8 - 18 45 to 60 minutes