This is a detailed and engaging lesson that looks at how molecules move between areas of differing concentrations by diffusion and then explores how this occurs across cell membranes and focuses on the alveoli.
The lesson begins by using a step by step format to write the definition for diffusion so that key terms such as concentration gradient are understood. Students will be introduced to this as a passive process so that they can understand how active transport differs when this is met in another lesson. Progress checks are written into the lesson at regular intervals so that students can assess their understanding against a displayed answer. Moving forwards, the lesson focuses on diffusion across cell membranes and uses the example of the exchange surface of the alveoli and blood capillaries to explore the different features which act to increase the rate of diffusion. The final part of the lesson briefly looks at how the villi in the small intestine increase the rate of diffusion.
This lesson has been written for GCSE aged students. If you’re looking for a lesson on this topic but for older students, then my alternative upload “Simple diffusion” will be more suitable
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