According to this:
The kidney contains afferent sensory nerve fibers that are located primarily in the renal pelvic wall where they sense stretch.
I think the stretch is due to urine. If I am correct then, I am unable to understand the following:
Stretch activation of these afferent sensory nerve fibers elicits an inhibitory renorenal reflex response wherein the contralateral kidney exhibits a compensatory natriuresis and diuresis due to diminished efferent renal sympathetic nerve activity. There is a negative feedback loop in which efferent renal sympathetic nerve activity facilitates increases in afferent renal nerve activity that in turn inhibit efferent renal sympathetic nerve activity so as to avoid excess renal sodium retention.
If I am correct , then how is renorenal reflex a negative feedback loop? Doesn't decreased efferent sympathetic activity increasing diuresis thus causing further increase in pressure in renal pelvis( contra lateral)?
Also how is sympathetic activity increasing renal pelvic pressure in the first place?
If I am wrong then, what is causing increase in renal pelvic pressure?
Support for my claim:
Hydronephrosis, a blockage of the outflow of urine or reverse flow of urine already in the bladder (called reflux) can cause the renal pelvis to become enlarged.
So, I think I am right in saying that urine increases pressure in renal pelvis, thus activating stretch receptors.