SA:V
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What is SA:V?
Surface area to volume ratio.
What is Fick’s law?
How fast diffusion works is proportionate to the surface area. Rate of diffusion = SA x Conc. difference/ Thickness of membrane
What factors affect the rate of diffusion?
• Temperature (The particles move around faster when the temperature is high, so they diffuse faster). • Metabolic rate (If chemical reactions are faster, products and reactants are used up faster).
How do you work out SA:V?
Example- - A cubes size is 4x4x4 - A cube has 6 sides - To clculate surface area (4x4x6=96) - To calculate volume (4x4x4=64) - SA:V = 3:2 (simplified) • SA = height x width x no.sides • V = height x width x length
What does a larger SA:V indicate?
Faster diffusion.