Biology · GCSE · Human Body Systems

Adrenaline, thyroxine and negative feedback

gcse-biol-4-5-3-6Free7:06Heddy Score 2 of 7, below the standard

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What you need to know

  • The kidneys remove urea and control the body's water and ion levels
  • Blood is filtered and useful substances are taken back in
  • ADH changes how much water the kidneys reabsorb, a negative feedback control

In this clip

0:00–7:06Homeostasisgcse-biol-4-5-1
Also coversAdrenaline, thyroxine and negative feedbackgcse-biol-4-5-3-6
Heddy Score2/7, Below the standard
  • 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 · not judged yet. 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.
★ passed · ☆ pending · ✕ failed
Our students

Not enough students yet

Our own students' answers. These are what move ★7 Proven.
How the Heddy Score works

Why we picked it

A separate-science GCSE lesson on the kidneys; the map has no kidney topic, so it is linked to homeostasis.

Cognito on YouTubechecked 2026-10-16