Tubular secretion (urine formation) T2 W9

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4 Terms

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Tubular secretion

•Tubular secretion is a passive or active process in which selected substances in the blood are moved into the filtrate.

<p>•Tubular secretion is a <u>passive or active process</u> in which selected substances in the blood are moved into the filtrate.</p>
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Tubular secretion function

  • Eliminating undesirable substances (wastes):

    • •Urea, uric acid, ammonium ions - passive transport.

    • Metabolites like drugs, hormones -  active transport.

    • Ridding the body of excess potassium ions – active transport (controlled by aldosterone).

  • Controlling blood pH: when blood pH drops slightly, the renal tubules will actively secrete more H+ into the filtrate.

<ul><li><p>Eliminating undesirable substances (wastes):</p><ul><li><p><span>•Urea, uric acid, ammonium ions - passive transport.</span></p></li><li><p><span>Metabolites like drugs, hormones -&nbsp; active transport.</span></p></li><li><p><span>Ridding the body of excess potassium ions – active transport (controlled by aldosterone).</span></p></li></ul></li><li><p><span>Controlling blood pH: when blood pH drops slightly, the renal tubules will actively secrete more H+ into the filtrate.</span></p></li></ul><p></p>
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Where does tubular secretion occur

Along the renal tubule, especially the DCT.

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Table of substances filtered and reabsorbed by the kidney per 24hrs

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