2.2- Adaptations for gas exchange

Question 1

(a)

The adaptations for gas exchange which allow an increase in body size and metabolic rate

Answer 1

• Be moist in terrestrial animals
• Be thin (short diffusion pathway)
• Have a large surface area
• Be permeable to gases
• Have a good blood supply to maintain concentration gradients (larger organisms only).

Question 2

(b)

Gas exchange in insects