Each group needs:

• 2 model "blocked arteries" made from about 4 inches (10 cm) of flexible tubing (~1.5-in [3.8-cm] diameter) clogged with play dough (or peanut butter); alternatively, use PVC pipe instead of tubing
• 2 clown balloons (long and thin)
• air pump, for clown balloons
• 2 straws
• 2 paper clips
• thin wire
• 1 pipe cleaner
• 4 rubber bands
• tape
• 1 square of aluminum foil, about 3 x 3 inches [7.6 x 7.6 cm]
• (optional) strip of metal mesh screen, about 4 x 1 inch [10 x 2.54cm]
• Clearing Blocked Arteries Measurements Worksheet, one per student

For the entire class to share:

• water source
• 2 liter container (from which to pour the same amount of water)
• large jug, bin or container, to catch poured water
• timer (such as the classroom clock with second hand or a person's watch or phone)
• Three Treatment Methods Images, an overhead projector transparency or printouts to show students