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SECTION VII. RENAL PHYSIOLOGY

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.

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.

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.

Glucose reabsorption occurs in the

A. proximal tubule.

B. loop of Henle.

C. distal tubule.

D. cortical collecting duct.

E. medullary collecting duct.

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

What is the clearance of a substance when its concentration in the plasma is 10 mg/dL, its concentration in the urine is 100 mg/dL, and urine flow is 2 mL/min?

A. 2 mL/min

B. 10 mL/min

C. 20 mL/min

D. 200 mL/min

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