Blood perfusion of the kidney of Lophius piscatorius L.: II. Influence of perfusion pressure on urine volume

Abstract

SummaryThe urine secretion of the kidneys of Lophius piscatorius perfused with heparinized Lophius blood is very sensitive to perfusion pressure below a critical level, above which it becomes insensitive. The response of the urine flow to pressure takes the form of an exponential curve.The blood flow through the kidneys, while rising slowly at pressures of about 20–30 mm of water, responds arithmetically to pressure above such levels.At present it is impossible to make out whether pressure or blood flow has the greatest influence on secretion.Water secretion in the aglomerular kidney is an active process. The oxygen consumption of the Lophius kidney is unmeasurably low, yet remains a possible factor in secretion.