Anatomy interview...?

where in the body do you find the ff process:
a.) diffusion
b.) diffusion through a liquid
c.) diffusion through a collloid
d.) filtrationAnatomy interview...?
a)diffusion- lungs
b)diffusion thru liquid-stomach
c)diffusion thru a colloid-intestine
d)filtration- kidney
Kidney
this is not an anatomy give somebody the third degree, it's a physiology or histo question...