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

In this online activity, learners measure their pulse rates and investigate how their pulses change when they engage in different activities. Learners record their pulse rates at rest, after...

In this environmental health activity, learners investigate their breathing and pulse rates, and learn how these measurements are affected by physical activity. There are three parts to this...

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...

In this activity, learners perform a simulated blood test procedure. They perform control reactions and test reactions, then use their observations to determine the blood type of different "...

Learners mix a solution containing luminol and copper with a fake blood solution. A chemical reaction between the luminol solution and fake blood (hydrogen peroxide) show learners a blue glow....

In this activity, learners use plastic tubing and a funnel to listen to their heart. Learners also discover that if they run around, their heart pumps harder and faster, making it easier to hear....

In this quick optics activity, learners use a dim point of light (a disassembled Mini MagLite and dowel set-up) to cast a shadow of the blood supply in their retina onto the retina itself. This...