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2.6 Homeostasis and Excretion

The Kidney

  • Can you define the term homeostasis?
  • Do you know that the control of body temperature and water content are both examples of homeostasis?
  • Can you name the organs of excretion, including the lungs, kidneys and skin?
  • In what metabolic processes would you find oxygen and carbon dioxide as waste products?
  • What does urine contain?
  • How is the kidney involved in osmoregulation and excretion?
  • Can you label a diagram of the urinary system?
  • Can you label a diagram of a nephron?
  • Can you explain the processes of ultrafiltration and selective reabsorption?
  • Where in the nephron is water reabsorbed into the blood?
  • How does ADH regulate the water content of the blood?

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Click here to learn the about the gross structure and function of the kidney

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Click here to use an animation to learn how the kidney works.

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Click here to see what happens in the nephron step by step.

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Click here to see exactly how ADH works to alter the water balance of the body.

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Test your knowledge with Quizlet: IGCSE Biology – The Kidney

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Watch this video to learn about osmoregulation.

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Control of Body Temperature

    • Do you understand that the control of body temperature is an example of homeostasis?
    • How is the skin involved in temperature regulation?

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Watch this video on the process of vasoconstriction.

Click here to investigate exactly how the skin is involved in temperature regulation.

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Test your knowledge with Quizlet: IGCSE Biology – Control of Body Temperature

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Extension material

If you have kidney failure you may need a kidney transplant. However, there is a shortage of donors and while you wait you will need to be put on a dialysis machine every couple of days in order to filter your blood. Click here to learn exactly how a dialysis machine works.

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