diving animal has a behavioural ability to vary VA by changing diving
lung volume (VA,o + VD,o) while its inherent anatomy does little
to affect VA and thereby Pcoll. To investigate the effect of changes in
diving lung volumewe kept the ratio constant as TAC:VD,o = 10:1 but
varied VA,o:VD,o. Another property of the model is that VA asymptotically
approaches zero so that Pcoll, and therefore, diffusion rate
may be over estimated at high pressures.