The table shows urea concentrations in blood entering and leaving two organs. Assume differences are mainly due to urea production or removal.
Table
| Organ | Entering in mmol dm−3\mathrm{mmol\,dm^{-3}}mmoldm−3 | Leaving in mmol dm−3\mathrm{mmol\,dm^{-3}}mmoldm−3 |
|---|---|---|
| X | 4.5 | 5.0 |
| Y | 5.0 | 3.0 |
Which explanation is consistent with the data?
X is the liver producing urea; Y is a kidney removing urea
X is a kidney producing urea; Y is the liver removing urea
X is the liver removing urea; Y is a kidney producing urea
X is a kidney removing urea; Y is the liver producing urea
94 exam-style questions on Edexcel GCSE Biology 7.4 Blood glucose and the urinary system, covering 7.4.1 Insulin and blood glucose control, 7.4.2 Glucagon and blood glucose regulation, 7.4.3 Type 1 and type 2 diabetes, 7.4.4 Structure of the urinary system, 7.4.5 Structure and function of the nephron, 7.4.6 ADH and water regulation, 7.4.7 Treatments for kidney failure, and 7.4.8 Production of urea in the liver. Each one has a worked solution and a mark scheme showing where the marks go.