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SECTION VII. RENAL PHYSIOLOGY

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In the presence of vasopressin, the greatest fraction of filtered water is absorbed in the

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A. proximal tubule.

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B. loop of Henle.

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C. distal tubule.

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D. cortical collecting duct.

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E. medullary collecting duct.

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In the absence of vasopressin, the greatest fraction of filtered water is absorbed in the

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A. proximal tubule.

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B. loop of Henle.

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C. distal tubule.

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D. cortical collecting duct.

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E. medullary collecting duct.

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If the clearance of a substance which is freely filtered is less than that of inulin,

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A. there is net reabsorption of the substance in the tubules.

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B. there is net secretion of the substance in the tubules.

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C. the substance is neither secreted nor reabsorbed in the tubules.

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D. the substance becomes bound to protein in the tubules.

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E. the substance is secreted in the proximal tubule to a greater degree than in the distal tubule.

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Glucose reabsorption occurs in the

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A. proximal tubule.

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B. loop of Henle.

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C. distal tubule.

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D. cortical collecting duct.

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E. medullary collecting duct.

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On which of the following does aldosterone exert its greatest effect?

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A. Glomerulus

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B. Proximal tubule

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C. Thin portion of the loop of Henle

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D. Thick portion of the loop of Henle

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E. Cortical collecting duct

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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?

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A. 2 mL/min

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B. 10 mL/min

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C. 20 mL/min

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D. 200 mL/min

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