Because kangaroo rats are better able to concentrate urine than humans are, it would be expected that, compared to the nephrons of human kidneys, the nephrons of kangaroo-rat kidneys would have:
A. shorter collecting ducts.
B. shorter loops of Henle.
C. longer collecting ducts.
D. longer loops of Henle
The correct answer is D, but I am wondering why isn't it C since the functions of collecting ducts are reabsorbing water and further concentrating urine. Please explain to help with studying, thank you.
The henle's loop along with the efferent and afferent vessels
are known as the vasa recta, which has a role in the conservation
of the water.
The filtrate which is filtered first passes to the ascending limb
which is not permeable to the water in this course the solutes like
chloride, sodium can enter and leave the ascending limb. Then when
this filtrate when passes through the descending limb only the
water is reabsorbed but not the solutes in the descending limb. So
when the animal if having a longer loop of Henle more amount of the
solutes like sodium , chloride will be reabsorbed and more amount
of water will be removed from the filtrate.
We can also say that the more the amount of the ion concentration
in the deep medulla of the kidney is directly related to the length
of loop of Henle.
Hope it is clear now.....
Thank you...
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