Humanity With Avian Lungs

In mammals - and that includes us humans - the lungs make up 7% of the total body volume. This allows us to inhale oxygen and exhale carbon dioxide, thanks to the pulmonary alveoli.

But bird lungs are unrivaled. They make up 15% of the total body volume. Gas does not mix between in- and ex- halation.

If we humans have a unidirectional respiratory system like a bird's, how would it affect the following?

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Humanity With Avian Lungs

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