1. 1.It is important that humans maintain a constant internal environment (homeostasis) 2.Humans respond to changes in external temperature in different ways Homeostasis Homeostasis

2. Homeostasis

3. Homeostasis

4. Functions of the skin

5. Structure of the skin Functions of the skin

6. Hot or cold?

7. 1.Water, and small molecules such as urea, salt and sugar, are filtered from the blood by the kidneys 2.Selective reabsorption of sugar, salt and some water occurs 3.Dialysis can be used in cases of kidney failure 4.Organs can be replaced by surgical transplants 5.Transplants may be rejected by the immune system Kidneys Kidneys

8. Kidneys

9. Kidneys

10. The Nephron

12. Kidneys Kidneys

13. ADH – too little water in blood ADH

14. ADH – too much water in blood ADH

15. Wordsearch Wordsearch

16. Quiz Quiz