Biology · KS3 Y7 · Human Body Systems

The human skeleton

The human skeletonFree2:31Heddy Score 3 of 7, below the standard

What you need to know

  • Bones are living tissue that is constantly broken down and rebuilt throughout life.
  • The skeleton supports the body and lets it move, and it stores minerals such as calcium.
  • Red bone marrow makes new blood cells.
  • The skull, spine and rib cage form the axial skeleton, which protects organs such as the brain, spinal cord, heart and lungs.
  • Without the pull of gravity, astronauts lose bone quickly, which shows bones respond to how they are used.

In this clip

Runs 2:31, from 0:40 to 3:11 of the full video.

Heddy Score3/7, 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.
★ passed · ☆ pending · ✕ failed
Our students

Not enough students yet

Our own students' answers. These are what move ★7 Proven.
On YouTube

6.83M views · 66K likes · CrashCourse 17.3M subscribers

As reported by YouTube on 2026-11-02. Not part of the Heddy Score.
How the Heddy Score works

Why we picked it

An engaging astronaut hook leads into a clear summary of what the skeleton does and which bones protect which organs.

CrashCourse on YouTubechecked 2026-10-22

Plays from youtube-nocookie.com. No YouTube cookies until you press play.