We were talking about our bodies, our skeletons, our muscles, our hearts and our lungs. We practised taking deep breaths using our noses to breathe in and our mouths to breathe out. We tried to imagine our lungs inside our rib cages.
We made a model lung using two bottles and a balloon. When we squeeze the bottle (our rib cages), the air is pushed out of the balloon (our lungs), and when we let go of the bottle the air rushes in again filling the balloon (lung) again. 
We all had a turn trying this. 
Next we used a 2litre bottle full of water, a basin, some piping and a straw each to see how much air can fit in our lungs. Most of us could empty about half of the bottle, but teacher could empty it all. Does she have bigger lungs because she is bigger, or does she just talk too much?
We made a model lung using two bottles and a balloon. When we squeeze the bottle (our rib cages), the air is pushed out of the balloon (our lungs), and when we let go of the bottle the air rushes in again filling the balloon (lung) again. 
We all had a turn trying this. 
Next we used a 2litre bottle full of water, a basin, some piping and a straw each to see how much air can fit in our lungs. Most of us could empty about half of the bottle, but teacher could empty it all. Does she have bigger lungs because she is bigger, or does she just talk too much?
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