13 Excretion in Humans
(Core / Extended)

13.1 Excretion in Humans
What you need to know:

1.  State that carbon dioxide is excreted through the lungs
   
2. State that the kidneys excrete urea and excess water and ions
   
3. Identify in diagrams and images the kidneys, ureters, bladder and urethra 
4. Identify in diagrams and images the structure of the kidney, limited to the cortex and medulla
   
5. 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)
   
6. Describe the role of the liver in the assimilation of amino acids by converting them to proteins
   
7. State that urea is formed in the liver from excess amino acids
   
8. Describe deamination as the removal of the nitrogen-containing part of amino acids to form urea
   
9. Explain the importance of excretion, limited to toxicity of urea 
   

Videos: Excretion - Part 1

Videos: Excretion - Part 2 - Dialysis (probably not in Syllabus anymore)

Videos: Ultrafiltration and Reabsorption 13.1.5

Videos: Deamination 13.1.6 to 13.1.9

EXAMPLE QUESTIONS

Videos: Aerobic Respiration Exam Question

Videos: The kidney_excretion (most of the questions are on this topic). You may skip homeostatisis questions now as it will be covered later.