1
brain
2
spinal cord
3
nerves
4
windpipe
5
bronchi
6
lung
the respiratory system
What do the lungs do? They bring oxygen to the body. The left lung is smaller than the right lung, to make room for the heart. The lungs get bigger when they fill up with air.
the nervous system
What does the brain do? It sends and recieves messages from all over the body. It controls everything in the body, including the heart, the lungs and the stomach.
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