Question

Q. 180. What fraction of cardiac output is filtered by kidney per minute?
1) 1/2
2) 1/3
3) 1/5
4) 1/4​

Answer 1

Answer:

Introduction

Glomerular filtration rate (GFR) represents the flow of plasma from the glomerulus into Bowman’s space over a specified period and is the chief measure of kidney function. The kidneys receive 20% to 25% of the cardiac output (about 1.0 to 1.1 liters per minute) with the blood entering individual glomerular tufts via the afferent arteriole and exiting through the efferent arteriole. Of this renal blood flow (RBF), only the plasma can cross the structures comprising the glomerulus. Thus, the renal plasma flow (RPF) is a more accurate expression and is calculated as follows: RBF(1-Hct)