Biology · KS3 Y8 · Human Body Systems
The breathing mechanism
The breathing mechanismFree7:34Heddy Score 3 of 7, below the standard
What you need to know
- Breathing (the respiratory system) and cellular respiration are different: breathing brings oxygen in and removes carbon dioxide, while respiration happens in cells.
- Cells need oxygen to release energy from glucose, and carbon dioxide is the waste gas produced.
- Air passes through the nose, trachea, bronchi and bronchioles to the alveoli, where gas exchange happens across thin walls with a large surface area and many capillaries.
- The rib cage protects the lungs, and the intercostal muscles and diaphragm change the size of the chest during breathing.
- Rising carbon dioxide in the blood is detected by the brain, which speeds up breathing during exercise.
In this clip
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 works3.95M views · 43K likes · Amoeba Sisters 2.98M subscribers
As reported by YouTube on 2026-11-02. Not part of the Heddy Score.Why we picked it
A friendly animated walk through the airways that keeps breathing and cell respiration clearly apart.
Amoeba Sisters on YouTubechecked 2026-10-22
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