• To understand the differences between aerobic and anaerobic respiration.

• Draw a poster to warn athletes of cramp, what causes it, how to avoid it etc.

• One of your friends is running a marathon for the first time. She will be running for quite a few hours so her muscles need lots of energy. Her friends notice some changes in her during the race:

1. She starts to look red
2. Her heartbeat increases
3. Her breathing rate increases
4. She needs to drink more
5. She loses water in sweat
   
   

Try to explain these changes and then decide whether you should call her an ambulance?

• What is the process that converts glucose and oxygen into energy for cells?
• There are two practical experiments to carry out now, one to test for carbon dioxide and one on yeast and fermentation. You need to write them both up fully with an analysis and evaluation.

Test your knowledge using the test bite on the link www.bbc.co.uk/schools/GCSEbitesize/biology/humansasorganisms/3respirationrev3.shtml