At sports day Karen and Elizabeth are chosen by their tutor group to run the 400m relay race. The students
decided that Elizabeth would run better than Karen, who is
a smoker.
Your Assignment:
1) Describe what happens to their circulatory system and breathing
system during and after the race.
2) Explain why each change happens
3) Why is Elizabeth likely to be a better runner than Karen? (think
about the lungs)
Key Words
Heart Lungs Alveoli Artery Capillaries Veins
Oxygen Carbon Dioxide Energy Water Sugar (glucose)
Diffusion Red blood cells Haemoglobin