1. The need for a circulatory system A level

A level lesson introducing the need for a circulatory system. This is something students find difficult to explain in words so I have linked it all to aerobic respiration and demand for oxygen and glucose and the removal of carbon dioxide. After the teacher explanation, students link key terms to explain the need for a transport system. They then self assess against a markscheme (provided in the presentation). The next activity asks students to apply their understanding to a question asking why spiders require a transport system. Again students self assess their answers against a model answer. Finally students revist surface area to volume ratio from GCSE. Activity and answers