According to the below figure, which letter corresponds to the lowest tubular fluid osmolarity under normal conditions?

Question

A.  A

B.  B

C.  C

D.  D

E.  E



Clarify Question

What is the key concept addressed by the question?

What type of thinking is required?



Gather Content

What do you already know about osmolarity? What other information is related to the question?

 

Choose Answer

Given what you now know, what information is most likely to produce the correct answer?

 

Reflect on Process

Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?

Answer 1

D.  D

Clarify Question
What is the key concept addressed by the question?
        · This question is asking where osmolarity is lowest in a nephron.
What type of thinking is required?
        · Apply level:
            o You are being asked to take what you already know and use, or apply, it to the osmolarity of fluid in different regions of the nephron.

Gather Content
What do you already know about osmolarity? What other information is related to the question?
        · Osmolarity is the solute concentration of a solution.
        · Osmolarity changes as fluid moves through the kidney.
        · Solutes are reabsorbed from fluid in the kidney in the loop of Henle.
        · Water is reabsorbed in the loop of Henle and in the collecting duct.
 
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
        · Sections A, B, and C in the diagram show the nephron structure before and in the loop of Henle.
        · Since solutes are still present at higher concentrations in before and as fluid moves through the loop of Henle, osmolarity is relatively high here.
        · Section D is a region where osmolarity would be lowest, as solutes have been removed, but not all water has been reabsorbed yet.
        · Section E, the collecting duct, would have increased osmolarity due to the reabsorption of water in this region.
 
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
        · Apply level:
            o Answering this question correctly depended on your ability to use the changes that occur in tubular fluid in a new situation. If you got an incorrect answer, did you remember that solutes are reabsorbed in the loop of Henle, or that water is reabsorbed in the loop of Henle and also in the collecting duct? Did you have trouble extending the nature of the tubular fluid to determine the correct answer?