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In this outdoor winter activity, learners search for and create hibernation sites that will protect gelatin "animals" from freezing.
Heart and Lungs
In this environmental health activity, learners investigate their breathing and pulse rates, and learn how these measurements are affected by physical activity.
How Long Can You Hold Your Breath?
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.
Raising the Level of Carbon Dioxide in Your Blood
In this activity (on page 146 of the PDF), learners will explore the effects of increased carbon dioxide in the bloodstream.