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Module 7: Gradient & Barriers: Passive

Overview

Students explore passive diffusion and osmosis. By adjusting parameters of the system, such as permeability of the membrane or particles concentration, students can learn to predict the resulting flow of water or dissolved materials. They can explore a model of an erythrocyte in hypotonic or hypertonic solutions.

Activities

• Cell Membranes: Diffusion and Osmosis
  
  
• Diffusion, Osmosis, and Dialysis
  
  
• Gas Diffusion: On Your Marks, Get Set, Go!
  
  
• Gas Effusion in a Two-Compartment Container
  
  
• Mass Effect of Diffusion
  
  
• Osmosis
  
  
• Osmosis and Osmotic Pressure: Simple Model
  
  

Objectives and Goals

Students will be able to:

• adjust parameters of a solution system, by varying the permeability of the membrane or particles concentration, to obtain a particular result.
• predict the resulting flow of water or dissolved materials.
• distinquish between diffusion and osmosis.
• link osmosis to several biological systems that work using this principle.

Standards

AAAS: THE LIVING ENVIRONMENT: CELLS - Every cell is covered by a membrane that controls what can enter and leave the cell.

THE LIVING ENVIRONMENT: CELLS - The work of the cell is carried out by the many different types of molecules it assembless, mostly proteins.

THE PHYSICAL SETTING: THE STRUCTURE OF MATTER - The rate of reactions among atoms and molecules depends on how often they encounter one another, which is affected by the concentration, pressure, and tempoerature of the recting materials.

NSES

Life Science: The Cell - Cells have particular structures that underlie their functions.