5.3 Diffusion

Question 1

What is diffusion

Answer 1

The net movement of particles from a region of high to low concentration

Question 2

What factors affect the rate of simple diffusion

Answer 2

TEMPERATURE
Higher temperature = ￪ Ek = ￪ rate of diffusion

CONCENTRATION GRADIENT
steeper concentration gradient = ￪ rate of diffusion

Question 3

What factors affect the rate of diffusion across membranes

Answer 3

TEMPERATURE
Higher temperature = ￪ Ek = ￪ rate of diffusion
CONCENTRATION GRADIENT
steeper concentration gradient = ￪ rate of diffusion
SURFACE AREA
larger surface area = ￪ rate of diffusion
MEMBRANE THICKNESS
thinner membrane = ￪ rate of diffusion

Question 4

In addition to temperature, concentration gradient, surface area & membrane thickness, what other factor affects the rate of facilitated diffusion?

Answer 4

Number of channel proteins available