A resourced lesson which looks at gas exchange at the alveoli and focuses on how these structures are adapted to carry out efficient gas exchange. The lesson includes an engaging lesson presentation (21 slides) and an associated worksheet.
The lesson begins by revisiting the idea of the surface area to volume ratio of small organisms against larger organisms. This will remind students that due to the low surface area to volume ratio of a human, they need to have adaptations at the exchange surfaces to increase the surface area. Moving forwards, a range of competitions are used to introduce students to the numbers and key terms associated with the alveoli. Students will learn how the large number (700 million) of alveoli leads to a large surface area and how a permeable membrane is also essential. Time is written into the lesson to allow students to think about key features, such as the one cell thick lining, and relate this to the rate of diffusion. The lesson concludes with students completing a passage about how the respiratory and circulatory systems work together to maintain a steep concentration gradient between the alveoli and the capillaries.
There are regular progress checks throughout the lesson to allow the students to check on their understanding. As always, the lesson finishes with a slide containing advanced terminology so that students who have aspirations to take A-level Biology can extend and deepen their knowledge
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