Topic 3 - Gas Exchange In Insects

Question 1

What structures do insects have for gas exchange?

Answer 1

• spiracles (tiny openings) on their body surface
• Spiracles lead to a network of tracheae, which branch into smaller tracheoles that deliver oxygen directly to tissue

Question 2

What are the adaptions of structures in an insect for gaseous exchange?

Answer 2

• tracheoles have thin walls: reducing the diffusion distance
• The large surface area: ensures sufficient oxygen delivery
• Abdominal movements: help ventilate the tracheal system maintains a steep diffusion gradient

Question 3

How do terrestrial insects prevent water loss?

Answer 3

• spiracles can open and close to reduce evaporation.
• Waterproof exoskeleton made of chitin prevent water loss through the body surface.
• Small tracheoles deliver oxygen directly to tissues, reducing the need for open spiracles.