Is the ability of the kidneys to maintain a relatively constant gfr despite changes in blood pressure without the input of nervous or hormonal control. the process whereby the flow of filtrate through the distal tubule results in changes in gfr is termed .the three components of the are the jg cells, the macula densa, and the mesangial cells. epithelial cells found where the distal tubule passes between the afferent and efferent arterioles are called the .the afferent arteriole contains cells called that secrete the enzyme renin. the afferent arteriole reflexively contracts in response to a rise in blood pressure, thus preventing a rise in gfr. this form of regulation is called the .an increase in the rate of filtrate flow through the distal tubule results in contraction of the and a decrease in gfr. when blood pressure drops, renin is released into the blood, resulting in an increase in the hormone , which acts to decrease gfr while simultaneously raising blood pressure