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Question

Active transport of substances from the blood into the nephron is called _____.The movement of substances from the filtrate back into the blood in the peritubular capillaries is called _____.


A

filtration; back flow

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B

tubular reabsorption; backflow

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C

tubular secretion; tubular reabsorption

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D

tubular reabsorption; tubular secretion

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Solution

The correct option is C

tubular secretion; tubular reabsorption


Tubular secretion is the transfer of materials from peritubular capillaries to the renal tubular lumen and occurs mainly by active transport. It is the tubular secretion of H+ and NH4+ from the blood into the tubular fluid that helps to keep blood pH at its normal level.


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