Question
A person inhales and exhales 2.00 L of $37.0^\circ\textrm{C}$ air, evaporating
1. $97.2 \textrm{ J/breath}$
2. $29.2 \textrm{ W}$
3. $9.49 \textrm{ w}$
4. $38.7 \textrm{ W}$
Metabolic rate while sleeping, for example, is $83 \textrm{ W}$. Therefore, yes, heat loss due to breathing is significant since it accounts for almost half of heat loss while sleeping.
Solution Video