For water to leave a kidney tubule by osmosis,the interstitial fluid around that region of tubule must be ____ relative to the filtrate inside the tubule.
A) hypertonic
B) hypotonic
C) isotonic
D) osmotic
E) permeable

Question

For water to leave a kidney tubule by osmosis,the interstitial fluid around that region of tubule must be ____ relative to the filtrate inside the tubule.  
A) hypertonic
B) hypotonic
C) isotonic
D) osmotic
E) permeable

Quizplus · Accepted Answer

The osmosis of water from the kidney tubule requires a concentration gradient. As the water moves from the region of high water concentration to low water concentration, the interstitial fluid must have a higher solute concentration than the filtrate inside the tubule in order to drive the movement of water out by osmosis. This means that the interstitial fluid must be hypertonic to the filtrate inside the tubule. Therefore, the best choice is A) hypertonic.

For Water to Leave a Kidney Tubule by Osmosis,the Interstitial