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Gas exchange in humans
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Total cards: 2•Content version: v4•Public deck•Updated: 8/1/2026
Card preview (2)
#1
Front (Question)
Features of a gas exchange surface? Why are they like this? 3 features
Back (Answer)
• Large surface area • Thin surface for substances to diffuse over. • Good blood supply and good ventilation to deliver oxygen and remove carbon dioxide quickly to maintain a high concentration gradient for both gasses. They need to maximise the rate at which diffusion occurs
#2
Front (Question)
How is the alveoli a gas exchange surface? 4 features
Back (Answer)
• Thin permeable walls. Keeps distance where gasses difuse between blood and air short • Moist lining, gasses dissolve before diffusing over cell membranes • Large surface area • high concentraction gradients as, blood is continuously flowing and lungs ventilate air.