A highly engaging lesson that looks at the structures that are found in the 1st line of defence and explores the methods of action use by phagocytes and lymphocytes. This lesson has been designed for GCSE students but could be used as an initial recap with A-level students before they go on to learn this topic in greater detail
The lesson begins by introducing the meaning of the 1st line of defence. A quick competition is used to challenge the students to recognise the names of some of these structures when their names have some letters missing. Time is taken to discuss the action of the cilia and skin and then students are challenged to make links to the related topics of enzymes and pH as they complete a passage about the role of hydrochloric acid in the stomach. Moving forwards, students will learn that there are two types of white blood cells, phagocytes and lymphocytes, and the details of their actions is explored. Key points such as the specificity of antibodies and the involvement of enzymes are discussed in detail so that this topic can be understood to the depth needed at this level. In addition to a number of games to maintain engagement, progress checks are written into this at regular intervals to allow the students to assess their understanding.
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