Biology · KS3 Y7 · Cells & Organisation
Diffusion
DiffusionFree1:35Heddy Score 3 of 7, below the standard
What you need to know
- Diffusion is particles spreading from a region of higher concentration to a region of lower concentration.
- The cell does not have to supply energy for it.
- Oxygen moves this way from the air in the lungs into the blood, where its concentration is lower.
- Some particles cross a membrane more readily through proteins, which is called facilitated diffusion.
In this clip
Runs 1:35, from 0:18 to 1:53 of the full video.
Heddy ScoreSeven checks every clip must pass before students see it: trusted, on the map, accurate, focused, accessible, safe, and proven by students.3/7, Below the standard
See the seven stars
- Trusted source · passed. The creator's own upload, live and playable here.
- On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
- Spec-true · not judged yet. Accurate, and right for the current UK specification.
- Focused · passed. One idea, short enough to watch in one go.
- Accessible · passed. Good captions, clear sound and pictures.
- Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
- Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.
Our students
Not enough students yet
Our own students' answers. These are what move ★7 Proven.On YouTube
How the Heddy Score works540K views · 4.3K likes · Free Animated Education 161K subscribers
As reported by YouTube on 2026-11-01. Not part of the Heddy Score.Why we picked it
It defines diffusion with the perfume and oxygen examples, at the level of particles moving down a gradient.
Free Animated Education on YouTubechecked 2026-10-20
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