1. The Need for a Circulatory System A level SNAB Biology Pearson

There are 2 PowerPoints. First Ppt, students are asked to identify which organisms they believe have a transport system, from a slide containing images of organisms. The answers appear and then students are asked to consider what factors contribute to organisms needing a transport system. Students are asked to recall what substances are carried in the blood. Answers are revealed as images on the following slide. Students are directed to the need for glucose and oxygen (and removal of carbon dioxide). They are asked to recall the word equation for aerobic respiration (on whiteboards). Three images appear as clues as to why some organisms require a transport system. The following slides are used to explain the reasons why. Students then link key terms to explain why organisms need a transport system - larger organisms, more metabolically active organisms and those with a small surface area to volume ratio. Slides are used to teach students how to calculate surface area to volume ratio. Students then complete a set of questions and use the markscheme to self assess answers. All answer included. Know it, Show it included. Principles of practice used when planning the