Studies on the permeability of the large intestine and urinary bladder of the tortoise (Testudo graeca) with special reference to the effects of neuro-hypophysial and adrenocortical hormones

摘要: Abstract An electrical p.d. and current were recorded across the large intestine urinary bladder of Greek tortoise. The short-circuit was measured, shown to depend on presence sodium mucosal side potassium serosal preparations. Cyanide (2 m M ) decreased in both intestine, 5 iodoacetate reduced it but not bladder. Neurohypophysial hormones (Pituitrin arginine vasotocin) did alter or permeability water either Pretreatment tortoises with a spirolactone (‘Aldactone’) shortcircuit intestine. d -aldosterone ( vitro increased short circuit phylogenetic significance these observations is discussed.