Countercurrent multiplication,

Question

Regarding countercurrent multiplication, which of the following statements is incorrect?

a) The ascending limb is permeable to sodium and chloride.

b) The nephron loop maximizes the efficiency of the absorption of water and sodium chloride.

c) The descending limb is impermeable to water.

d) The movement of sodium and chloride follows its concentration gradient.

e) The movement of water occurs due to sodium and chloride concentrations in the extracellular fluid.

Answer 1

False: the descending limb is impermeable to water.

The descending limb of the nephron loop is relatively impermeable to solutes and freely permeable to water.