Gce Model Questions Vol1 2019 Biology Question 10
Practice objective / multiple choice question 10 from the 2019 Gce Model Questions Vol1 Biology examination.
In a mammal the glomerular filtration rate (GFR) is 120 mL min⁻¹. 65 % of the filtered water is reabsorbed in the proximal tubule, 15 % of the water remaining after the proximal tubule is reabsorbed in the loop of Henle, and 10 % of the water remaining after the loop is reabsorbed in the distal tubule. The fluid that reaches the collecting duct becomes urine unless further water is reabsorbed. (a) Calculate the urine flow rate (mL min⁻¹) before any influence of antidiuretic hormone (ADH). (b) If ADH acting on the collecting duct causes an additional 50 % of the water entering the duct to be reabsorbed, what is the new urine flow rate (mL min⁻¹)?
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About This Question
This is Gce Model Questions Vol1 2019 Biology Question 10. It is one of the objective questions from the 2019 Gce Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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