A normal urine output is considered to be:
a. 80 to 125 mL/min.
b. 180 L/day.
c. 80 mL/min.
d. 1 to 2 L/day.
D
At a normal glomerular filtration rate (GFR) of 80 to 125 mL/min, the kidneys produce 180 L/day of filtrate. As the filtrate passes through the various components of the nephron's tubules, 99% is reabsorbed into the peritubular capillaries or vasa recta. Eventually, the remaining filtrate (1% of the original 180 L/day) is excreted as urine, for an average urine output of 1 to 2 L/day.
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