The lung contains small spherical gas-exchange chambers called alveoli, where a single alveolus can be modeled as being a perfect sphere, explaining why they need small radius to accommodate their thin walls for gas exchange at atmospheric pressure.
The lung contains small spherical gas. Exchange chambers called alveoli. Why they need small radius to accommodate their thin walls for gas exchange at atmospheric pressure. This was what Exchange chambers were explaining. A single alveolus can be modeled as being a perfect sphere.