What is the permeability of the descending limb of the loop of Henle?
a) Permeable to water and solutes
b) Impermeable to water
c) Impermeable to solutes
d) Permeable to water but impermeable to solutes

What happens to water in the descending limb of the loop of Henle?
a) Moves out via osmosis
b) Moves out via diffusion
c) Moves into the limb
d) None of the above

What is the permeability of the ascending limb of the loop of Henle?
a) Impermeable to water
b) Permeable to water and solutes
c) Permeable to water
d) Impermeable to solutes

What happens to solutes in the ascending limb of the loop of Henle?
a) Diffuse into the interstitial fluid
b) Diffuse out of the limb
c) Remain in the limb
d) None of the above