Diffusion Flashcards
Is diffusion an active or passive process?
-passive process - no ATP required
Diffusion is the movement of molecules or ions from…
- a region of high concentration to low concentration down a concentration gradient
What factors is diffusion affected by?
-concentration gradient
-thickness of exchange surface
-surface area
-size of diffusing model
-nature of diffusing molecules
-temperature
Thinner membrane is better for diffusion because…
-shorter distance, more molecules can diffuse over a given time
Greater concentration between two areas is good for diffusion because…
-more molecules diffuse in a given time
Larger SA for diffusion
-more molecules diffuse over a given time
Rate of diffusion equation
SA x diff in conc/length of diffusion path
Size of molecules affect diffusion because
-smaller molecules diffuse faster than large molecules
Nature of diffusing molecules affects diffusion because
-fat-soluble molecules diffuse faster than water-soluble molecules and non-polar molecules diffuse faster than polar ones
Temperature affects diffusion because
-molecules will have more kin etic energy and will diffuse faster
