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  • Support
  • Protection
  • Framework for muscle attachment

Insects have an external skeleton - This is made of Chitin and creates a protective covering. Hard covering can restrict growth and need to shed an old one and a new one is grown.

Some animals have an internal skeleton - Made of cartilage which is still found at the tip of your nose for example. This is a living tissue and has a framework of connections with other systems in the body such as joints, muscles and blood vessels.

Structure of a Long Bone:

  • The head is covered with smooth cartilage
  • Shaft is hollow


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