Diffusion & the alveoli (Edexcel GCSE Biology): Flashcards
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Diffusion definition
Diffusion definition
Movement from high to low concentration
Type of transport diffusion is
Type of transport diffusion is
Passive transport (no energy needed)
Concentration gradient
Concentration gradient
Difference in concentration between two areas
Two gases that diffuse easily
Two gases that diffuse easily
Oxygen and carbon dioxide
Direction O2 diffuses in lungs
Direction O2 diffuses in lungs
From alveoli into blood
Direction CO2 diffuses in lungs
Direction CO2 diffuses in lungs
From blood into alveoli
Effect of shorter distance on diffusion
Effect of shorter distance on diffusion
Faster diffusion
Effect of steeper conc. gradient
Effect of steeper conc. gradient
Faster rate of diffusion
Effect of larger surface area
Effect of larger surface area
Faster diffusion rate
Effect of higher temperature
Effect of higher temperature
Increased rate of diffusion
What are alveoli?
What are alveoli?
Tiny air sacs in the lungs
Thickness of alveoli walls
Thickness of alveoli walls
One cell thick
Why alveoli have large surface area
Why alveoli have large surface area
Millions of alveoli present
Blood supply around alveoli
Blood supply around alveoli
Dense network of capillaries