This unit takes a look at organ transplants; what they are, their history and why they are needed. Within this context, the concepts of cells, tissues, organs and organ systems are explored, together with the use of the microscope.

This unit introduces ideas about acids, alkalis and indicators in the context of acid manufacture. There is also an introduction to ideas about risk assessment and hazard classification.

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.