plumiADH and control of plasma concentration: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 7.4.6 ADH and control of plasma concentration, 2019–2025, with mark schemes and examiner’s reports where available.
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Q3(b)(i)
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All 26 questions on ADH and control of plasma concentration, as a list
- January 2025, Unit 5, Q3(b)(i) (2 marks): Calculate the volume of urine produced in one day with an ADH concentration of 75%. Assume that the concentration of ADH stays constant throughout the day. Give
- January 2025, Unit 5, Q3(b)(ii) (2 marks): Describe the effect of ADH concentration on the concentration of urine and the rate of urine production. (2)
- January 2025, Unit 5, Q3(c) (3 marks): Explain how ADH affects the movement of water from the lumen of the collecting duct into the blood. (3)
- January 2025, Unit 5, Q8(a) (1 mark): Give one reason why ‘optimal hydration’ is beneficial (paragraph 1). (1)
- January 2025, Unit 5, Q8(c) (2 marks): Explain one reason why a ‘typical man’ has a larger daily requirement for water compared with a ‘typical woman’ (paragraph 9). (2)
- January 2025, Unit 5, Q8(d) (5 marks): Explain how the sodium ion concentration in the blood is kept within a narrow range (paragraph 17). (5)
- October 2024, Unit 5, Q6(b)(i) (1 mark): Which is the specialised receptor that detects changes in the plasma solute concentration? (1) A baroreceptor B chemoreceptor C osmoreceptor D thermoreceptor
- October 2024, Unit 5, Q6(b)(ii) (1 mark): Suggest one reason why the plasma solute concentration of the blood needs to be kept within a narrow range. (1)
- October 2024, Unit 5, Q6(c) (4 marks): Drinking too much water causes the plasma solute concentration to decrease and the blood volume to increase. Describe how the body responds to this change. (4)
- June 2024, Unit 5, Q2(a)(iii) (1 mark): Which labelled parts would be involved in controlling the solute concentration of blood plasma? (1) A P and Q B Q and R C P and R D S and T
- June 2024, Unit 5, Q7(b) (4 marks): A group of individuals gave a urine sample and then immediately drank 1 000 cm3 of water. Urine samples were then collected at 30-minute intervals. The volumes
- June 2024, Unit 5, Q7(c) (3 marks): A person with hyponatraemia suffers from excessive production of antidiuretic hormone (ADH) from the pituitary gland. This causes changes in the sodium ion conc
- January 2024, Unit 5, Q7(c)(i) (2 marks): Calculate the difference in urine produced over seven days by the kangaroo rat and by the human. Give your answer in standard form. (2) Answer
- 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(c)(i) (2 marks): Calculate the ratio of the mean rate of urine production for the females in the three groups. Express your answer as nothing to drink : water to drink : salt so
- June 2023, Unit 5, Q5(c)(ii) (2 marks): Describe two conclusions that can be drawn from the results of this investigation. (2)
- June 2023, Unit 5, Q5(c)(iii) (2 marks): Explain the effect on the mean urine output of the group drinking water. (2)
- 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
- June 2022, Unit 5, Q3(a)(i) (1 mark): Which of the following produces ADH? (1) A adrenal gland B hypothalamus C medulla oblongata D pituitary gland
- June 2022, Unit 5, Q3(a)(ii) (1 mark): Which structures does ADH act on? (1) A capillaries B collecting ducts C proximal tubules D ureters
- June 2022, Unit 5, Q3(a)(iii) (1 mark): The control of plasma concentration and blood volume in the body is an example of which type of process? (1) A countercurrent multiplier B habituation C negativ
- June 2022, Unit 5, Q3(a)(iv) (1 mark): Name the type of receptor in the body that detects changes in the plasma concentration. (1)
- January 2022, Unit 5, Q4(c) (4 marks): Describe how ADH is involved in the control of the water potential of the blood. (4)
- June 2021, Unit 5, Q4(a) (1 mark): Antidiuretic hormone (ADH) is required for homeostasis. How many of these parts of the kidney respond to ADH? • Bowman’s capsule • collecting duct • loop of Hen
- October 2020, Unit 5, Q3(a)(ii) (2 marks): Calculate the rate of removal of ADH from the blood between 4 and 8 hours. (2) Answer
- October 2020, Unit 5, Q3(b) (6 marks): Taking MDMA causes a person to be very thirsty. This can lead to swelling of the brain, which can be fatal. The table shows some laboratory results for one case
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