State that urea is formed in the liver from excess amino acids
State that urea is formed in the liver from excess amino acids

State that urea is formed in the liver from excess amino acids
Outline the structure and function of a nephron and its associated blood vessels, limited to: (a) the role of the glomerulus in the filtration from the blood of water, glucose, urea and ions (b) the role of the nephron in the reabsorption of all of the glucose, some of the ions and most of the water back into the blood (c) the formation of urine containing urea, excess water and excess ions (details of these processes are not required)
Identify in diagrams and images the structure of the kidney, limited to the cortex and medulla
Identify in diagrams and images the kidneys, ureters, bladder and urethra
State that the kidneys excrete urea and excess water and ions
State that carbon dioxide is excreted through the lungs
Explain how the spread of STIs is controlled
Describe the methods of transmission of HIV
State that HIV infection may lead to AIDS
State that human immunodeficiency virus (HIV) is a pathogen that causes an STI