Which of the following is TRUE about how water is handled by the nephron?
A. Water is filtered out of glomerular capillaries by bulk flow.
B. Water is actively reabsorbed from the proximal tubule, and Na+ follows down its diffusion gradient.
C. Water is actively secreted into the descending loop of Henle.
D. The permeability of the ascending limb of the loop of Henle is modified by vasopressin.
E. Vasopressin inserts pumps in the collecting duct membrane that move water against its concentration gradient.
A
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Which statement regarding sodium reabsorption is not accurate?
a. it plays a role in glucose, amino acid, and urea reabsorption in the proximal tubule. b. it is under hormonal control in the distal tubule. c. in the loop of Henle, it contributes to the formation of concentrated urine. d. approximately 0.5% of sodium is reabsorbed on a daily basis. e. aldosterone is a key hormone involved in facultative reabsorption.