Take a breath — Modeling the respiratory system, Gr. 9–12 Volume 8 | Gr. 9-12 | U28115 Download Materials list • Scissors • 4 large balloons (3 for the model, 1 for lung capacity test) • 2 rubber bands • Electrical tape • Plastic 2-liter bottle • Flexible plastic tubing – 8″ • Y-shaped hose connector Related