Gas Exchange Systems

• Explain adaptations in various gas exchange systems: in single-celled organisms, insects’ tracheal systems, fish gills, and dicotyledonous plants’ leaves
• Single-celled organisms exchange gas across their body surface
• Insects’ tracheal system comprises tracheae, tracheoles, and spiracles
• Fish exchange gas across gills consisting of gill lamellae and filaments; counter-current principle is involved
• Dicotyledonous plants use leaves for gas exchange, specifically through mesophyll and stomata
• This knowledge can be applied to any system
• You will receive needed information to apply your knowledge to new concepts
• It’s advised to draw and label diagrams of these structures for revision.