what is this?
windpipe/trachea
what are these?
lungs
the ... lung is smaller to give space to the heart
left
what is this?
diaphragm
what is this?
nose
this is the ...
respiratory system
what are these?
nostrils
We breathe in ...
oxygen
what are these?
bronchi
the left lung is smaller to give space to the ...
heart
when we run, our breathing is ...
heavy/fast
we breathe out ...
carbondioxide