Breathe in and breathe out. What happens to your chest?
Our lungs are like balloons. As we inhale oxygen, they inflate. As we exhale carbon
dioxide, they deflate. Construct a paper lung and inflate it.
Spot the tiny dots. What do alveoli do as we take in oxygen and breathe out carbon dioxide?
Directions:
1) Cut out square; place printed side up. Fold in half horizontally to crease. Flip over and fold on each diagonal.
2) Collapse into a triangle by pulling the edges of the horizontal fold in