EFFICIENT DIFFUSION

• ADAPTIONS FOR EFFICIENT DIFFUSION IN INSECTS?

  1. Large number of fine tracheoles
  2. Thin tracheole walls
  3. Short distance between spiracles and tracheoles
  4. Use of O2/ production of CO2
• WHAT DO THE LARGE NUMBER OF FINE TRACHEOLES DO?

  provide large SA
• WHAT DO THE THIN TRACHEOLE WALLS DO?

  provide short diffusion pathway
• WHAT DOES THE SHORT DISTANCE BETWEEN SPIRACLES AND TRACHEOLES DO?

  provides short diffusion pathway
• WHAT DOES THE USE OF O2 AND PRODUCTION OF CO2 DO?

  maintains steep diffusion gradient