Movement across cell membranes.

This bundle of 3 lessons looks at the different methods by which molecules move across cell membranes. These lessons have been written for GCSE aged students, but could be used with younger students who are studying this topic and want to be challenged. Students will understand how the passive processes of diffusion and osmosis move molecules with the concentration gradient whilst active transport moves them against the gradient and therefore requires energy in the form of ATP. Time is taken to go through the factors that increase the rate of diffusion as well as relating this to the living organism with examples in the body.