Lab 2: Movement Through Membranes

Dialysis test

Chapter 2

During the second week of lab, students continue reviewing the general concepts of diffusion, net diffusion and osmosis. They also learn about tonicity and how to relate the concentration of one solution compared to another (hypotonic, isotonic and hypertonic). Lastly students look at what factors affect membrane permeability.

crenation test

Topics to Review Before Lab:

  • Principles of diffusion (diffusion vs. net diffusion)
  • Cell membrane structure
  • Definition of a concentration gradient
  • Permeable molecules vs. impermeable molecules
  • Passive trasport vs. active transport
  • Tonicity