A hospital patient receives a nutrient solution containing amino acids. On one day, the solution supplies more amino acids than the patient's body requires.
Give the organ in which the surplus amino acids are broken down.
Ammonia is formed when the surplus amino acids are broken down.
Name the substance into which the ammonia is converted.
The table shows the concentration of the waste substance named in part (b) in blood entering and leaving the patient's kidneys.
| Blood sample | Concentration of the waste substance in mmol per dm³ |
|---|---|
| Entering the kidneys | 6.0 |
| Leaving the kidneys | 4.5 |
Describe what the measurements show about the kidneys.
92 exam-style questions on AQA GCSE Biology 4.2 Respiration, covering 4.2.1 Aerobic and anaerobic respiration, 4.2.2 Response to exercise, and 4.2.3 Metabolism. Each one has a worked solution and a mark scheme showing where the marks go.