This unit builds on unit 8A 'Food and digestion', which needs to have been covered first. It is closely linked to the section on breathing and smoking in unit 9B 'Fit and healthy'. The unit relates to work on foods and fuels in unit 7I 'Energy resources' and to work on oxygen and burning in unit 7F 'Simple chemical reactions'.
The unit lays the foundation for work on the composition of the blood, the structure of blood cells and the circulatory system at key stage 4.
The energy transfer ideas of unit 7I 'Energy resources' are used in the context of respiration. Energy should be distinguished from 'stuff' (the food as energy resource or fuel).
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