BIOL 2

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?

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