The Need for Specialised Gas Exchange Surfaces (OCR A-Level Biology A): Flashcards
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Practise the cards
10 cards from this deck
Aerobic respiration: requirements & waste product
Aerobic respiration: requirements & waste product
Requires O₂, produces CO₂
Oxygen deficit
Oxygen deficit
When O₂ supply can't match demand during intense activity
3 requirements for effective gas exchange surfaces
3 requirements for effective gas exchange surfaces
Permeable, moist, thin
Why gas exchange surfaces must be moist
Why gas exchange surfaces must be moist
Gases cross membranes only when dissolved, not as gas
Max diffusion distance for small organisms relying on it
Max diffusion distance for small organisms relying on it
Under 50 μm
3 problems for larger organisms' gas exchange
3 problems for larger organisms' gas exchange
↑diffusion distance, ↑metabolic demand, waterproof covering
SA:V ratio as organism size increases
SA:V ratio as organism size increases
Decreases
SA:V ratio formula for cube with side L
SA:V ratio formula for cube with side L
6/L
Ventilation
Ventilation
Moving respiratory medium over gas exchange surface
Respiration
Respiration
Biochemical process in cells releasing energy from glucose