diffusion

Question 1

what is diffusion

Answer 1

-movement of molecules from an area of high concentration to low down the concentration gradient

-may or may not be across a membrane

-passive process doesnt involve energy/ ATP

-particles due to their kinetic energy

Question 2

list the molecules that can move across membrane by simple diffusion

Answer 2

-oxygen
-co2
-fatty acids, glycerol
-vitamins
-hormones

Question 3

what is dynamic equilibrium in diffusion

Answer 3

equal amounts of molecules move from one side to the other at the same time

Question 4

what is facilitated diffusion

Answer 4

when too large molecules dont diffuse directly through phospholipid bilayer but through carrier or channel protein

-down concentration gradient

-no ATP required .passive

Question 5

what factors affect rate of diffusion and how?

Answer 5

-temp= as temp increases rate of diffusion increases as paricles have more kinetic energy

-diffusion distance= shorter= faster rate of diffusion

-surface area= bigger surface area = more space area that molecules can more across so faster

-size of diffusing particle = smaller = faster rate

-concentration gradient = greater difference = faster at trying to achieve equilibrium

Question 6

draw and explain the graph of simple and facilitated diffusion

Question 7

what is fick’s law

Answer 7

rate of diffusion (a) surface area x concentration gradient / diffusion distance

Question 8

how does surface area to volume affect rate of diffusion

Answer 8

the larger the surface area to volume ratio the faster the rate of diffusion