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A-Level Biology OCR A

Air Movements Adaptations Insects High Energy System Thorax

Insects with high energy demands have mechanically ventilated tracheal systems and collapsible/expandable tracheae/air sacs to enhance gas exchange efficiency.

Los insectos con alta demanda energética tienen sistemas traqueales mecánicamente ventilados y tráqueas/sacos aéreos expandibles y colapsables para aumentar la eficiencia del intercambio gaseoso.

Front Describe two adaptations that insects with very high energy demands have to increase efficiency of their gas exchange system.
Back Adaptations of insects with high energy demand:
  • Mechanical ventilation of tracheal system
    • Air pumped into system by muscular pumping movements of thorax and or abdomen
    • Movements change volume of body - changes pressure in tubes, causing air in/out

  • Collapsible enlarged trachea or air sacs 
    • Act as reservoirs, inflated/deflated by ventilating movements of thorax and abdomen

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