In mammal X, the osmolarity of the interstital fluid surrounding the loop of Hen

Question

In mammal X, the osmolarity of the interstital fluid surrounding the loop of Henle ranges from 300 mOsm/L in the cortex to 500 mOsm/L in the inner medulla. Given this information, answer the following:

a) What will be the approximate osmolarity of the filtrate at the hairpin turn in the loop of Henle?

b) What will be the approximate osmolarity of the filtrate at the very end of the ascending limb of the loop of Henle?

c) For the filtrate to have an osmolarity of 500 mOsm/L at the end of the collecting duct, what must be true?

d) Predict the habitat of the organism in question, i.e., do you think this organism has ready access to freshwater?

Explanation / Answer

a. 400 - 700 mOsm/L

b. 100 - 200 mOsm/L

c. normally at the end of collecting duct the osmolarity is 1200 mOsm/L but here it is 500 mOsm/L ,

d.so the organism doesnot have free access to fresh water.

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