Creating Model Working Lungs: Just Breathe

Each group needs:

• 2-liter empty plastic bottle with cap
• 2 plastic drinking straws; available inexpensively at restaurant supply stores or donated by fast-food chains; do not use the flexible drinking straws
• 2 9-inch balloons
• 1 larger balloon; for example, for a punch ball
• 2 rubber bands
• Lung Worksheet (PDF), one per student