This unit covers diet, digestion and the transport of and uses for the nutrients in digested food. All of this is looked at within a context of food advertising (including diets and supplements).

Using the theme of sports (particularly athletics), this unit covers the chemical reaction of respiration in living organisms and the structure and function of the human respiratory and circulatory systems.

The work of doctors and the diseases that they come across provide the theme for this unit. Work also includes microbes, population growth, uses of microbes, disease transmission, disease prevention, natural defences, vaccines and medicines.