Igcse Model Questions Vol1 2023 Biology Question 19
Practice objective / multiple choice question 19 from the 2023 Igcse Model Questions Vol1 Biology examination.
A person has a blood sodium concentration of \(145\ \text{mmol L}^{-1}\) and a blood volume of \(5.0\ \text{L}\). They drink \(0.5\ \text{L}\) of pure water (containing no sodium), which mixes instantly with the blood. After 30 minutes, the kidneys excrete \(0.2\ \text{L}\) of urine whose sodium concentration is the same as the blood at that moment. What is the blood sodium concentration after the urine is excreted? Give your answer to one decimal place.
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About This Question
This is Igcse Model Questions Vol1 2023 Biology Question 19. It is one of the objective questions from the 2023 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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