Instructions

10.) ADH
a. increases water permeability of distal convolued tubule

b. increases the water permeabilty of the collecting tubule

c. increeases the urea permeability of the collecting tubule

d. all of the above

11.)What percentage of urea is reabsorbed by the proximal convoluted tubule?

a. 25

b. 50

c. 100

d. none of the above

12.) The anatomical substrate of the countrcurrent exchanger is the

a, renal vein

b. glomerular capillaries

c. vasa recta

d. none of the above

13.) The greatest amount of reabsorption takes place in the

a. proximal convoluted tubules

b. diluting segment

c. descending limb of henle’s loop

d. none of the above

14.) If:  Uosm < Posm,

a. free water clearance is positive

b. free water clearance is negative

c. free water clearance is neutral

d. none of the above

15.) If :  Uosm > Posm,

a. free water clearance is negative

b. free water clearance is positive

c. free water clearnce is neutral

d, none of the above

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