First slide

Function of the Tubules

Question

In a person, 178 litres glomerular filtrate is formed per day. If tubular reabsorption is 177 litres per day and tubular secretion is 0.25 litres per day, then the rate of urinary excretion is

Difficult

Solution

Urinary excretion = (Glomerular filtration – tubular reabsorption) + tubular secretion
= 178 – 177 + 0.25
= 1.25 litres per day

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