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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

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.



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These materials are based upon work supported
by the National Science Foundation under grant numbers
9980620, ESI-0242701 and EIA-0219345

Any opinions, findings, and conclusions or recommendations expressed in this
material are those of the author(s) and do not necessarily reflect
the views of the National Science Foundation.