The lungs are the respiratory organ which allows the take-up of oxygen and the release of CO2. They are present in most animals which breathe air including many fish species.

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How far does the diaphragm stretch when it contracts?

I have been wondering about this for this entire day today and I can't seem to find an answer. How far, exactly, does the diaphragm stretch for tidal breathing and what is its maximum stretch length?
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Is lung size/shape a factor in long-continuous running of animals?

Apart from other factors, does lung shape/structure/size play any role in long-continuous running animals. Is there any similarity in lung structure between different long-continuous running species? ...