This fully-resourced lesson focuses introducing the kidneys and its importance in maintaining water balance in the body. *this is separate biology topic * Students should be able to describe the different sources of water loss and gains, understand the foundations of how urine is produced, explain how the body may produce vary concentrations and amount of urine depending on given situations Due to the detail of this lesson, it is estimated that this will take about 45 minutes - 1 hour of GCSE teaching time to deliver