By the time the filtrate reaches the loop of Henle, the reabsorption of water and ions has
A)left the filtrate iso- osmotic.
B)left the filtrate hyperosmotic.
C)left the filtrate hypoosmotic.
D)removed all of the sodium from the filtrate.
E)removed all of the potassium from the filtrate.

Question

Quizplus · Accepted Answer

The filtrate is iso-osmotic when it reaches the loop of Henle because the proximal tubule reabsorbs water and ions in equal proportions, maintaining the osmolarity similar to that of blood plasma.

By the Time the Filtrate Reaches the Loop of Henle