Cell Membrane Diffusion
Simulating Selective Permeability with Dialysis Tubing
This simulation demonstrates how cell membranes allow some substances to pass through while blocking others. Observe how iodine diffuses through the dialysis tubing while starch molecules remain inside.
Starch Solution
Time: 0 minutes
Results
Observation:
The dialysis tubing represents a semipermeable cell membrane. Click "Start Experiment" to observe diffusion over time.
Diffusion and Selective Permeability
1. Selective Permeability:
Cell membranes allow small molecules (like iodine) to pass through while blocking larger molecules (like starch).
2. Diffusion:
Molecules move from areas of high concentration to low concentration until equilibrium is reached.
3. Indicator Reaction:
Iodine turns dark purple when it reacts with starch. This color change helps visualize the diffusion process.
