Biology — Gas Exchange (Alveolus)
Diffusion of O2 and CO2 across the alveolar membrane.
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digraph GasExchange {
rankdir=LR;
node [shape=box, style=rounded];
"Inhaled air" -> Alveolus;
Alveolus -> Blood [label="O2 diffuses in"];
Blood -> Alveolus [label="CO2 diffuses out"];
Blood -> "Body tissues" [label="O2 transport"];
"Body tissues" -> Blood [label="CO2 from respiration"];
}