Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. How do substances move in and out of cells?
   • diffusion
2. What is the definition for diffusion?
   • Diffusion is the spreading out of the Particles of any substance in solution, or Particles of a gas, resulting in a net movement from an area of higher concentration to an area of lower concentration.
3. Name two substances that are transported in and out of cells by diffusion during gas exchange
   • oxygen and carbon dioxide
4. How does the waste product urea reach the kidney to be excreted?
   • Urea diffuses from Cells into the blood plasma to reach the kidney for excretion
5. How does the concentration gradient affec the rate of diffusion?
   • The bigger the concentration gradient the faster the rate of diffusion will be
6. How does the difference in temperature affect the rate of diffusion?
   • The higher the temperature the faster the rate of diffusion
7. How does the surface area of the membrane affect the rate of diffusion?
   • The bigger the surface area the faster the rate of diffusion will be