Five questions are presented and answered as a means of delivering information on the respiratory system. Using red and blue game chips, physiology learners model the movement of blood through the lungs. Groups of learners time how long each can hold his breath, deplete their oxygen supply by breathing into a bag, and then repeat the test. Caution: Be aware of the maturity and emotional state of participants if you are considering this lab activity with your class as the danger of fainting is present.