Diffusion and Cell Size and Shape

This discussion/worksheet activity helps students understand that cell size is limited by the very slow rate of diffusion over any substantial distance and the insufficient surface-area-to-volume ratio for larger cells.  In addition, students calculate why these problems do not apply to long slender cells or parts of cells (e.g. the axons of neurons that extend from your spinal cord to your foot).

 The first attached file has the Student Handout and the second attached file has the Teacher Notes.