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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 discover how their heart rate changes in different situations.

In this activity, learners compare ways to measure their heart rates. Learners build their own stethoscopes and learn how exercise affects heart rate.

Doctors often send a sample of blood to a lab, to make sure their patients are healthy.

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