Tissue fluid pressure (P t) and lymph pressure (P l) as well as fluid transport between initial
lymphatics and tissue matrix were determined in the villi of the jejunum in vivo and in vitro.
When the intestine was absorbing fluid, free tissue fluid as a micro pool appeared in the villi.
P t and P l were 2.4±0.7 and 2.9±0.8 mm Hg (mean±SE), respectively, in the villi in vivo (26
villi of 5 rats) or 0.8±0.4 and 1.2±0.5 mm Hg, respectively, in the villi in vitro (30 villi of 5 rats).
P l was significantly (P< 0.01) higher than P t. When Evans blue in saline was continuously …