Parameter	Symbol
Compartment concentrations
bronchioles	$C_{\mathrm{bro}}$,$C_{\mathrm{end}-\mathrm{tidal}}$
alveoli	$C_{\mathrm{A}}$
arterial	$C_{\mathrm{a}}$
mixed-venous	$C_{\overline{\mathrm{v}}}$
residual body	$C_{\mathrm{res}}$
fat	$C_{\mathrm{fat}}$
inhaled (ambient)	$C_{\mathrm{I}}$
Compartment volumes
bronchioles	$V_{\mathrm{bro}}$
mucosa	$V_{\mathrm{muc}}$
alveoli	$V_{\mathrm{A}}$
fat	$V_{\mathrm{fat}}$
residual body	$V_{\mathrm{res}}$
Fractional blood flows at rest
fractional flow bronchioles	$q_{\mathrm{bro}}$
fractional flow fat	$q_{\mathrm{fat}}$
fractional residual flow	$q_{\mathrm{res}}$
Partition coefficients
blood:air	${\lambda }_{\mathrm{b}:\mathrm{air}}$
blood:residual body	${\lambda }_{\mathrm{b}:\mathrm{res}}$
blood:fat	${\lambda }_{\mathrm{b}:\mathrm{fat}}$
mucosa:air	${\lambda }_{\mathrm{muc}:\mathrm{air}}$, ${\lambda }_{\mathrm{water}:\mathrm{air}}$
mucosa:blood	${\lambda }_{\mathrm{muc}:\mathrm{b}}$
fat:air	${\lambda }_{\mathrm{fat}:\mathrm{air}}$
Physiological parameters
linear metabolic rate	$k_{\mathrm{met}}$
endogenous production	$k_{\mathrm{pr}}$
cardiac output	${\dot{Q}}_{\mathrm{c}}$
alveolar ventilation	${\dot{V}}_{\mathrm{A}}$
conductance parameter	D