The Story:
All animals must have air to live. Air is a mixture of many gases. The most important gas for breathing is oxygen.
We breathe air through our noses. It goes down a tube, called the windpipe, into our lungs. Our lungs are two large, spongy in our chest. We can see our chests get bigger as we breathe air in.
Our lungs help oxygen in the air get into our blood. The oxygen then goes with the blood to all parts of our body. People going to places where there may not be enough oxygen must take it with them in tanks.
Most big animals get oxygen through their lings as well, but some small animals breathe in other ways. Earthworms take in oxygen through their thin skin. Slugs and snails have a large hole in their sides and incests have many tiny holes to breath through.
Water creatures have other ways of breathing. A water beetle comes to the surface and puts the tip of its tail out into the air. It then takes a bubble of air under the water. It breathes the air in the bubble through little tubes in its tail. Fishes get their gills to take oxygen out of the water. You can see the air in water, when water is heated in a saucepan and it bubbles.
Some Questions About This Story:
1)How is the oxygen passed around our body?
2)How do Slugs breathe?
3)How can we see that there is air in water?
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