The Descending Limb of the Loop of Henle ________

Question

The descending limb of the loop of Henle ________.
A) is freely permeable to sodium
B) contains fluid that becomes more concentrated as it moves down into the medulla
C) is not permeable to water
D) none of the above

Accepted Answer

The descending limb of the loop of Henle is permeable to water but not to sodium, allowing water to be reabsorbed into the surrounding medullary tissue. This process concentrates the fluid as it moves deeper into the medulla.