Diffusion Across Semipermeable Membranes

This Diffusion Across Semipermeable Membranes interactive also includes:

Mitochondria use two semipermeable membranes to work properly. Young scientists adjust the pore size for two membranes. They then observe the diffusion of two different sizes of molecules.

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CCSS: Adaptable
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Instructional Ideas
  • Discuss which systems require something to pass through two different membranes
  • Challenge scholars to see what pore size allows for the fastest balance of water molecules while keeping the protein contained
Classroom Considerations
  • Relies on prior knowledge of diffusion and molecule size
  • Allows scholars to trace one molecule as it moves
  • Requires very little class time
  • None