Unformatted text preview: as very fine, thin-walled tubules through which oxygen and carbon dioxide can diffuse freely into and out of the tissues. Diagram of insect tracheal system muscle fibres finely branched tracheae (tracheoles) supplying muscle fibres with air main trachea body wall (cuticle) spiracle Cockroach Caterpillar Tracheal supply to muscle tissue spiracles © D.G. Mackean...
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- Fall '11
- D.G. Mackean, main trachea, finely branched tracheae