Figure 1  .

Illustration of the isolated vascularly perfused porcine ileum placed in a thermostatically controlled bath (37°C). The segment receives perfusion medium containing oxygenated erythrocytes through the ileal artery. Perfusion flow is kept constant and the perfusion pressure measured continuously. The extrinsic nerves to the segment situated around the artery can be electrically stimulated. The lumen of the segment is perfused at a constant rate (not illustrated) and both luminal effluent and the venous effluent are collected.