Urea is formed when excess amino acids are broken down.
Which statement describes the production and removal of urea?
it is produced in the bladder and removed by the kidneys
it is produced in the kidneys and removed by the liver
it is produced in the liver and removed by the kidneys
it is produced in the kidneys and removed by the bladder
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.