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144. Long loops of Henle on juxtamedullary nephrons allow
for greater concentration of urine. For an individual with
highly concentrated urine, filtrate entering the loop of
Henle is likely to be:
A. more concentrated than filtrate exiting the loop
Henle.
B. less concentrated than filtrate exiting the loop of
Henle.
C. more voluminous than filtrate exiting the loop of
Henle.
D. less voluminous than filtrate exiting the loop of
Henle.
A is correct. The loop of Henle concentrates the medulla via a net loss of solute to the medulla. This process is
critical to the function of other parts of the nephron; a medulla with a high concentration of solute allows for
the passive absorption of water from the filtrate in other areas of the nephron.
i dont think i get the explanation. tell me if my thinking is correct. so a concentrated urine means either too much solutes in the filtrate, or not enough water in the filtrate (ie, too much water absorption). and water is passively reabsorbed into the medulla as you go down the descending loop of henle...and that happens because water was initially absorbed right before that in the proximal tubule because of the overall net secretion of solutes into the filtrate (so the filtrate had a higher osmotic pressure than the surroundings)...and i dont know where to go from here...i get all the facts, but im not sure how to connect them to get to the answer
for greater concentration of urine. For an individual with
highly concentrated urine, filtrate entering the loop of
Henle is likely to be:
A. more concentrated than filtrate exiting the loop
Henle.
B. less concentrated than filtrate exiting the loop of
Henle.
C. more voluminous than filtrate exiting the loop of
Henle.
D. less voluminous than filtrate exiting the loop of
Henle.
A is correct. The loop of Henle concentrates the medulla via a net loss of solute to the medulla. This process is
critical to the function of other parts of the nephron; a medulla with a high concentration of solute allows for
the passive absorption of water from the filtrate in other areas of the nephron.
i dont think i get the explanation. tell me if my thinking is correct. so a concentrated urine means either too much solutes in the filtrate, or not enough water in the filtrate (ie, too much water absorption). and water is passively reabsorbed into the medulla as you go down the descending loop of henle...and that happens because water was initially absorbed right before that in the proximal tubule because of the overall net secretion of solutes into the filtrate (so the filtrate had a higher osmotic pressure than the surroundings)...and i dont know where to go from here...i get all the facts, but im not sure how to connect them to get to the answer