Biology unit 2 revision cards

  • Created by: Rosie
  • Created on: 23-05-11 20:27

Gas Exchange in Insects

What creates these features of the gas exchange surface in insects?

1. Large SA:V ratio

2. Thin membrane surface

3. Movement of environmental medium

4. Movement of internal medium

Why do insects need an exchange surface?

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Gas exchange in Insects

1. Small, thin, highly branched tracheoles

2. Tracheole walls thin and in direct contact with muscles

3. Air moves down a concentration gradient + ventilation

4. NO internal medium for gas exchange

Insects require gas exchange surface because:

they have waterproof covering and small SA:V ratio

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