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In this activity about the brain and sleep (on page 138 of the PDF), learners measure their resting breathing rates. Learners will discover that breathing frequencies vary amongst individuals.

This is an activity about lung capacity. Learners will measure their own lung capacity using a homemade spirometer.

In this activity (on page 142 of the PDF), learners will compare breathing rates before and after hyperventilation to explore how reduced carbon dioxide levels in the blood lower the need to breathe.

In this activity (on page 146 of the PDF), learners will explore the effects of increased carbon dioxide in the bloodstream.

In this activity, learners work in teams to construct human lung models from small plastic beverage bottles and balloons.

In this activity, learners act out the flow of blood in the human body! A great way to get learners up and moving while learning about the circulatory system.