Factors that Affect Diffusion (AQA GCSE Biology): Flashcards
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Practise the cards
13 cards from this deck
What is a concentration gradient?
What is a concentration gradient?
Difference in particle concentration between two areas
How does concentration gradient affect diffusion?
How does concentration gradient affect diffusion?
Steeper gradient = faster diffusion rate
Effect of higher temperature on diffusion rate
Effect of higher temperature on diffusion rate
Increases rate of diffusion
Why temperature affects diffusion
Why temperature affects diffusion
Changes kinetic energy of particles, affecting movement speed
Effect of larger surface area on diffusion rate
Effect of larger surface area on diffusion rate
Increases rate of diffusion
Example of large surface area for gas exchange
Example of large surface area for gas exchange
Alveoli in the lungs
Example of large surface area for nutrient absorption
Example of large surface area for nutrient absorption
Villi in the small intestine
Effect of shorter diffusion distance on rate
Effect of shorter diffusion distance on rate
Faster diffusion
How molecule size affects diffusion rate
How molecule size affects diffusion rate
Smaller molecules diffuse faster than larger ones
Which molecules diffuse easier through membranes?
Which molecules diffuse easier through membranes?
Nonpolar molecules (easier than polar molecules)
3 factors for efficient gas exchange in lungs
3 factors for efficient gas exchange in lungs
Large surface area, steep gradient, short diffusion distance
Features of villi maximizing diffusion rate
Features of villi maximizing diffusion rate
Large surface area and thin walls
Waste product removed from cells by diffusion
Waste product removed from cells by diffusion
Carbon dioxide