The objective of this project is to have a clearer idea of what is the role of the diaphragm (dome-shaped muscle at the bottom of the lungs) as we inhale and exhale.
As we inhale, this muscle contracts, it is pushed down as the air fills in our lungs. As we exhale, the muscle relaxes, it moves upwards as air gets out of our lungs.
Watch this video, make your model and observe what happens as you pull down the balloon.
In your Science notebook, make a drawing of your observation and explain what happened.
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