Immediate Local Responses of the Kidney to Changes in Blood

Question

Immediate local responses of the kidney to changes in blood flow to maintain GFR occur via
A) autoregulation.
B) countercurrent multiplication.
C) hormonal regulation.
D) autonomic regulation.
E) cephalic reflexes.

Accepted Answer

Immediate local responses of the kidney to changes in blood flow to maintain GFR occur via autoregulation. Autoregulation is the ability of the kidney to maintain a relatively constant GFR despite changes in arterial pressure. This is achieved by the constriction or dilation of afferent and efferent arterioles in response to changes in pressure, which helps to maintain the filtration pressure and GFR. Countercurrent multiplication and hormonal regulation are not involved in immediate local responses of the kidney. Autonomic regulation and cephalic reflexes are involved in the long-term regulation of GFR, but not in the immediate local responses.