A dialysis membrane allows urea and glucose to pass through but prevents large plasma proteins from passing through. Fresh dialysis fluid contains no urea and the same glucose concentration as normal blood plasma.
Which movement is expected when blood has a high urea concentration and a normal glucose concentration?
glucose moves out of the blood; there is no net movement of urea
urea moves out of the blood; there is no net movement of glucose
both urea and glucose move out of the blood at the same rate
neither urea nor glucose moves between blood and dialysis fluid
45 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.