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How Long Can You Hold Your Breath?
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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.
Lung Model: Make a Lung and Diaphragm
Source Institutions
By building a model of a lung and diaphragm, learners discover the function of various parts of the body's respiratory system.