Biology Made Fun · Go Further
Watch It Move: Facilitated Diffusion
A “Watch it move” animation for Biology Made Fun, Unit 5 — the code printed on page 53, Unit 5's Color & Label membrane page.
Animation — Facilitated DiffusionThe concept animation for this page will be embedded here.
Key ideas from the lesson
- Facilitated diffusion is the movement of molecules across the membrane through a protein channel, without using energy.
- It is still diffusion: molecules move from an area of high concentration to an area of low concentration. The channel is a doorway, not a pump.
- The membrane's selective permeability is what makes the doorway necessary — the bilayer lets some substances through directly and blocks others.
Why this helps
This is the “Watch it move” companion to Unit 5's Color & Label membrane page: the channel you labeled, doing its one job.
Try this
Watch for the direction of travel: do the molecules move toward more crowding or less? And what — if anything — does the cell spend to move them?
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