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The figure on page 281 of Costanzo says that dilation of the afferent arteriole (mediated by decreased sympathetic activity in response to increased salt intake) results in increased GFR, which in turn causes decreased reabsorption of Na+ in the proximal tubule.
Doesn't this go against the principle of glomerulotubular balance, which states that increases in filtration at the glomerulus are balanced by increases in reabsorption at the PCT?
Doesn't this go against the principle of glomerulotubular balance, which states that increases in filtration at the glomerulus are balanced by increases in reabsorption at the PCT?