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Chapter 37. Renal Function & Micturition

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The greatest fraction of filtered sodium is reabsorbed in what portion of the nephron?

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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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The correct answer is A. The majority of filtered sodium is reabsorbed in the proximal tubule. The final determination of sodium reabsorption is completed in the 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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The correct answer is A. The proximal tubule the major site of filtered water reabsorption.

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If the clearance of a substance that 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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The correct answer is A. Clearance is the amount of a substance that is filtered and is present in the urine. If the amount of the substance in the urine is less than that of inulin which is filtered but not reabsorbed or secreted, that substance must be reabsorbed in the tubules.

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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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The correct answer is A. The transport maximum of glucose is in the proximal tubule, not any other tubular segment.

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

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