Physiology - from Ganong's 23rd ed Chapter 38 - Renal

Question 1

In the presence of vasopressin, the greatest fraction of filtered water is absorbed in the:
A) Proximal tubule
B) Loop of Henle
C) Distal Tubule
D) Cortical Collecting Duct
E) Medullary Collecting Duct

Answer 1

A. Check the graph.

Question 2

In the absence of vasopressin, the greatest fraction of filtered water is absorbed in the 
A) Proximal tubule
B) Loop of Henle
C) Distal tubule
D) Cortical collecting duct
E) Medullary collecting duct

Answer 2

A.

Question 3

If the clearance of a substance which is freely filtered is less than that of inulin,
A) There is net reabsorption of the substance in the tubules.
B) There is net secretion of the substance in the tubules
C) The substance is neither secreted nor reabsorbed in the tubules
D) The substance becomes bound to protein in the tubules
E) The substance is secreted in the proximal tubule to a greater degree than in the distal tubule

Answer 3

A.

Question 4

Glucose reabsorption occurs in the
A) Proximal tubule
B) Loop of Henle
C) Distal tubule
D) Cortical collecting duct
E) Medullary collecting duct

Answer 4

A. Check the graph.

Question 5

On which of the following does aldosterone exert its greatest effect?
A) Glomerulus
B) Proximal tubule
C) Thin portion of the loop of Henle
D) Thick portion of the loop of Henle
E) Cortical collecting duct

Answer 5

E.

Question 6

What is the clearance of a substance when its concentration in the plasma is 10mg/dL, its concentration in the urine is 100mg/dL, and urine flow is 2mL/min?
A) 2mL/min
B) 10mL/min
C) 20mL/min
D) 200mL/min
E) Clearance cannot be determined from the information given.

Answer 6

C.

Question 7

As urine flow increases during osmotic diuresis
A) the osmolality of urine falls below that of plasma
B) the osmolality of urine increases because of the increased amounts of nonreabsorbable solute in the urine.
C) the osmolality of urine approaches that of plasma because plasma leaks into the tubules.
D) the osmolality of urine approaches that of plasma because an increasingly large fraction of the excreted urine is isotonic proximal tubular fluid.
E) the action of vasopressin on the renal tubules is inhibited

Answer 7

D