Multiple Choice
In renal physiology, which structure is primarily responsible for filtering the blood to form the initial filtrate?
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25. The Urinary System
Renal Physiology Step 1: Glomerular Filtration
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In normal adult renal physiology, approximately how much glomerular filtrate is produced by both kidneys per day?
A
About 180 L/day
B
About 1.8 L/day
C
About 500 mL/day
D
About 18 L/day
Verified step by step guidance1
Understand that glomerular filtration rate (GFR) refers to the volume of filtrate formed by the kidneys per unit time, typically measured in milliliters per minute (mL/min).
Recall that the average GFR for both kidneys combined in a healthy adult is approximately 125 mL/min.
Calculate the total volume of filtrate produced per day by multiplying the GFR by the number of minutes in a day: \$125 \, \text{mL/min} \times 60 \times 24$.
Convert the result from milliliters to liters by dividing by 1000, since 1000 mL equals 1 L.
Interpret the final value as the approximate daily volume of glomerular filtrate produced by both kidneys, which is about 180 liters per day.
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