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Diffusion, Osmosis and Cell Membranes

Objectives

In this unit of instruction, the students will explore some of the properties and processes of the cell membrane, and in the process acquire an understanding of some basic concepts of physical science. Upon completion of this unit, each student should be able to:

• understand the functional role of the cell membrane in the survival of the cell.
  
  
• understand the basic mechanisms of passive transport through the cell membrane
  
  
• describe and demonstrate basic principles of equilibrium using appropriate models
  
  
• describe diffusion using the kinetic behavior of gases as a model
  
  
• measure the rate of diffusion of a gas (Graham's Law)
  
  
• describe osmosis using equilibrium and diffusion concepts
  
  
• observe and describe the effects of various solutions of varying concentration on the tonicity of plant and animal cells
  
  
• mrelate the concepts of osmosis and diffusion to the environmental requirements of plant and animal cells
  
  
• oplan and execute an experiment to test a hypothesis regarding osmosis in red blood cells
  
  
• collect, record, and analyze data from experimental procedures

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