1. Why are Cells Small?
Bell Ringer: What happens to the surface area to volume ratio as the cell gets larger?

2. Diffusion and Osmosis
Most of the materials a cell needs come from passive transport of some kind
Transport occurs through the membrane
So… more membrane with smaller volume = faster diffusion

3. Surface Area to Volume Ratio
As a cell gets bigger, its surface area and volume increase. However, the volume grows larger faster than the surface area.

4. Surface Area to Volume Ratio
Big ratio = faster diffusion

5. Surface Area to Volume Questions
Complete lab questions. Turn into box (both papers) when finished.