plumiSelective reabsorption and the loop of Henle: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 7.4.5 Selective reabsorption and the loop of Henle, 2019–2025, with mark schemes and examiner’s reports where available.
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Q6(d)(i)
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All 17 questions on Selective reabsorption and the loop of Henle, as a list
- October 2024, Unit 5, Q6(d)(i) (1 mark): Which method reabsorbs glucose from the proximal convoluted tubule into the blood? (1) A co‑transport with sodium ions B endocytosis C exocytosis D osmosis
- June 2024, Unit 5, Q7(a)(iii) (3 marks): The electron micrograph shows part of a cell lining the proximal convoluted tubule. structure A structure B (Source: © Jose Calvo/Science Photo Library) Explain
- January 2024, Unit 5, Q7(b) (3 marks): In mammals, urine is produced by ultrafiltration and the selective reabsorption of solutes and water. Kangaroo rats are adapted to survive on a diet of dry seed
- January 2024, Unit 5, Q7(c)(ii) (4 marks): Comment on the differences in water gain and water loss between the kangaroo rat and the human. Use your knowledge and information in the diagram to support and
- June 2023, Unit 5, Q5(a)(iii) (1 mark): Which transport mechanism is responsible for the uptake of glucose into the cells of the proximal tubule? (1) A endocytosis B exocytosis C osmosis D sodium co-t
- June 2023, Unit 5, Q5(b) (4 marks): Describe how the loop of Henlé acts as a countercurrent multiplier. (4)
- October 2022, Unit 5, Q5(a) (1 mark): How many of the following adaptations enable a camel to reduce its water loss? • production of very concentrated urine • high glomerular filtration rate • long
- October 2022, Unit 5, Q5(b)(ii) (2 marks): Suggest two reasons why there is no correlation between water use and mean mass for the species given in the table. (2)
- October 2022, Unit 5, Q5(c) (3 marks): The kangaroo rat is another animal that lives in a hot, dry environment. In an investigation, kangaroo rats were given either fresh water, sea water or no water
- October 2022, Unit 5, Q5(d) (2 marks): The kangaroo rat’s kidneys play an important role in the process of conserving water. Explain how the nephrons (kidney tubules) in the kidneys of the kangaroo r
- June 2022, Unit 5, Q2(b) (3 marks): Describe how glucose reabsorption takes place in the nephron. (3)
- January 2022, Unit 5, Q4(a)(ii) (1 mark): Where in the kidney are most amino acids reabsorbed from the nephron? (1) A collecting duct B distal tubule C loop of Henle D proximal tubule
- January 2022, Unit 5, Q4(b) (4 marks): Explain how the loop of Henle acts as a countercurrent multiplier to produce concentrated urine. (4)
- June 2021, Unit 5, Q4(b)(ii) (1 mark): Name the structures labelled S. (1)
- June 2021, Unit 5, Q4(d) (3 marks): The table shows the concentration of glucose and urea in the blood plasma, glomerular filtrate and urine of an individual. Concentration Concentration in Concen
- June 2021, Unit 5, Q4(e) (2 marks): An individual produced 0.83 cm3 of urine each minute. Calculate the volume of urine produced by this individual in 24 hours. Assume the urine production is at a
- October 2020, Unit 5, Q2(c) (3 marks): The kidney controls blood volume and plasma concentration by regulating the loss of water in urine. Some mammals have adaptations to their kidneys that enable t
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