How does air enter the lungs?
Resting position · Breathe in · Breathe out
How does air enter the lungs?
Find the trachea, two lungs and the diaphragm below. Lungs expand with the chest cavity.
During inhalation the diaphragm contracts and moves down. Chest volume increases, pressure in the lungs falls and air enters.
During quiet exhalation the diaphragm relaxes. Volume decreases and air leaves. Oxygen passes into blood in the alveoli.
For adults · discuss together
Transparent chest; intercostal muscles and detailed alveoli are omitted.
Before experience
Ask: “What do you think will happen?” Let the child check his guess first.
After the experience
What has changed? What remains the same? Where can you notice a similar phenomenon?
Ready for another discovery?
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Compare plant and animal cells and spot the differences.
Explore ↗Ages 10–14
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Explore the roles of light, water and carbon dioxide.
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Light and plant · Add a herbivore · Add a predator
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