to test the hypothesis that the permeability of weak acids across the intestinal mucosa affects their ability to stimulate pancreatic bicarbonate output , we compared pancreatic bicarbonate secretion in response to intestinal perfusion with an acid presumed to be permeable to cell membranes , lactic acid ( 90 daltons ) , and an acid presumed to be impermeable , acidified bovine serum albumin ( about 70,000 daltons ) .
C0021839
intestinal
C0021853
intestinal