Biology › Section O · Hormones, bones, and muscles › Topic O.5

Bone

Bone looks like dead scaffolding, but it is a living organ that is built, reshaped and rebuilt throughout life. Knowing how it forms, grows and heals explains why children grow taller, why astronauts lose bone and why a broken arm mends.

In this topic

  • Bone is a living organ
  • Six shapes of bone
  • Inside a long bone
  • Four bone cells
  • Two routes to bone
  • How long bones lengthen and thicken
  • Worked example: reading growth plates
  • Remodelling: bone that reshapes itself
  • Worked example: following a fracture as it heals
  • Worked example: bend or break?
  • Common mistakes to avoid
  • Key takeaways

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