A scientist measures the rate of urine production in a person at different concentrations of ADH in the blood.
Table
| ADH concentration in arbitrary units | 0 | 2 | 4 | 6 | 8 |
|---|---|---|---|---|---|
| Rate of urine production in cm3/min\text{cm}^3/\text{min}cm3/min | 15.0 | 8.0 | 3.5 | 1.5 | 1.0 |
Which statement describes and explains the urine produced at an ADH concentration of 8 arbitrary units, compared with 0 arbitrary units?
a smaller volume of more concentrated urine, because less water is filtered
a smaller volume of more concentrated urine, because more water is reabsorbed
a larger volume of more concentrated urine, because more salt is reabsorbed
a smaller volume of more dilute urine, because less water is reabsorbed from it
72 exam-style questions on OCR GCSE Biology 3.3 Maintaining internal environments, covering 3.3.1 Importance of a constant internal environment, 3.3.2 The skin and body temperature, 3.3.3 Insulin and blood sugar, 3.3.4 Glucagon and blood sugar, 3.3.5 Type 1 and type 2 diabetes, 3.3.6 Osmotic changes in body fluids, 3.3.7 Kidneys and water balance, 3.3.8 Structure of the kidney and tubule, 3.3.9 ADH and kidney tubule permeability, and 3.3.10 Responses to temperature and osmotic challenges. Each one has a worked solution and a mark scheme showing where the marks go.