Dišni sustav

$\text{Zrak: nos} \rightarrow \text{ždrijelo} \rightarrow \text{grkljan} \rightarrow \text{dušnik} \rightarrow \text{bronhi} \rightarrow \text{bronhioli} \rightarrow \text{alveole}$

$Hb + O_2 \rightleftharpoons HbO_2 \quad (\text{u plućima} \rightarrow; \text{u tkivima} \leftarrow)$

$\text{Udisaj: dijafragma} \downarrow, \text{rebra} \uparrow \rightarrow \text{volumen} \uparrow \rightarrow \text{tlak} \downarrow \rightarrow \text{zrak ulazi}$

$\text{Regulacija disanja: CO}_2 \text{ u krvi} \uparrow \Rightarrow \text{disanje brže i dublje}$