HEALTH · Jun 1, 2026 Most digestive enzymes produced by the small-intestinal wall are bound to the apical (brush-border) cell membrane of intestinal epithelial cells rather than being freely secreted into the intestinal lumen. NOT BS
HEALTH · May 30, 2026 Under normal conditions, only a very small fraction of dietary amino acids in the small-intestinal lumen are diverted by other substances or are consumed by colonic bacteria before being absorbed, so amino-acid loss is very low. HARDLY BS
HEALTH · May 30, 2026 Most intestinal juice in the small intestine comes from the contents released when small-intestinal epithelial cells rupture and slough off, rather than from fluid actively secreted by intestinal glands. TOTAL BS
HEALTH · May 30, 2026 After proteases finish digesting food in the duodenum, they move with chyme into the mid and distal small intestine and begin digesting themselves and other enzymes into amino acids. MOSTLY BS
HEALTH · May 30, 2026 Reduced perfusion of the small-intestinal mucosa can impair enterocyte renewal and contribute to villous blunting (villous atrophy), reducing absorptive surface area. NOT BS