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In this simulation, learners act out each digestive function of the organs, tissues, and cells in the digestive tract.

In this activity, learners perform a simulated blood test procedure.

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 make a model of a one-way heart valve to investigate how a heart controls the direction of blood flow.

In this activity on page 9 of the PDF, learners test how flavoring extracts move through the walls of a balloon.