Year 6 have been learning about the different systems in the body. In particular, they have been investigating how heart rate is affected by exercise, but first they had to learn how to set up a scientifically fair test. This they did by experimenting with vinegar and bicarbonate of soda. They researched the respiratory and circulatory systems and planned to test what they had learnt. Next, they  carried out their own fair test, only changing one variable.