5.3 Diffusion

Question 1

diffusion def

Answer 1

net movment of particles from an area of high conc to area of lower conc
(down a conc gradient)
passive process

Question 2

Factors that effect the rate of

diffusion

and there direction of influence

Answer 2

• temp warmer=fster rate
• conc differnece higher=faster rate
• thickness of membrane thinner=faster
• surface area larger=faster

Question 3

facilitated diffusion

Answer 3

diffusion across membranse through channel proteins and can be carrier proteins too, still passsive

Question 4

membranes with channel proteins are……. permeable

Answer 4

selectivley (most channels are specfict to on ion or molecule)

Question 5

what can diffuse easily through the phospholipid bilayer?

Answer 5

• small and non polar eg.
• O2 CO2
• H2O small enough despite being polar