Excretion in mammals: role of the renal pelvis in the modification of the urinary concentration and composition.

摘要: The mammalian renal pelvis has previously been regarded as having no physiological function other than that of a receptacle for the urine before it moves through ureter. It long known in mammals shows elaborate extensions bring intimate contact with outer and inner medullary tissue. epithelium covering these areas is type indicates transport solutes water can take place across it. Physiological studies have shown urea readily move papillary epithelium. pronounced ability ruminants to conserve when placed on low protein diet coincides highly developed specialized fornices secondary pouches. suggested conservation animals takes partly pelvic where returned blood. A hypothesis also proposed concentrating mechanism which recycling from plays an important role.