Passive Transport and Tonicity

This video discusses simple diffusion and introduces the concept of osmosis, the movement of water across the plasma membrane to a place where there is a higher concentration of solutes. Make sure you can define hypertonic, hypotonic, and isotonic solutions.

After you have watched this video, you should be able to define diffusion and explain why it is a passive process that does not require energy, define terms hypertonic, hypotonic, and isotonic solutions, and define osmosis and predict the direction of water movement based on differences in solute concentrations in the cell or solutions.