Figure 6.

Arterial NH₃ concentration as a function of the fraction of portal blood shunted to systemic veins, bypassing the liver.

Notes: The black line represents rates of NH₃ production by the kidney and gastrointestinal tract and utilization by muscle, unchanged from the normal values listed in Table 1. The red line represents muscle NH₃ utilization in proportion to arterial NH₃, increasing as arterial NH₃ increases. The green line represents hepatic artery blood increasing to compensate for decreased portal liver flow, increasing linearly by a factor of 1.5 as the shunt fraction goes from 0 to 1.