Which of the Following Statements About the Loop of Henle

Multiple Choice

Which of the following statements about the loop of Henle is true ?

A) The walls of the descending loop are relatively impermeable to water.
B) The walls of the descending loop are relatively permeable to sodium.
C) The walls of the ascending loop are relatively permeable to water.
D) The walls of the ascending loop are relatively permeable to sodium.
E) The entire loops is relatively permeable to sodium.