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Reabsorption and Secretion Along the Nephron Summary Table - Anatomy & Physiology (view source)
Revision as of 14:57, 4 September 2008
, 14:57, 4 September 2008no edit summary
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<TD BGCOLOR="#C1f0f6">'''Water'''</TD>
<TD BGCOLOR="#C1f0f6">'''H<sup>+</sup> and HCO<sub>3</sub><sup>-</sup>'''</TD>
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* The secretion of H<sup>+</sup> in this section of the nephron is mainly a result of the Na<sup>+</sup>/H<sup>+</sup> antiporter in the apical membrane using secondary active transport.
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*HCO<sub>3</sub><sup>-</sup> is reabsorbed here in a different way to other substances. The presence of hydrogen in the lumen causes some amount of it to dissociate to carbon dioxide and water via the enzyme carbonic anhydrase. These enter the epitehlial cells where they are reformed using the same enzyme. The HCO<sub>3</sub><sup>-</sup> then leaves the cell using the basolateral 3HCO<sub>3</sub><sup>-</sup>/Na<sup>+</sup> symporter.
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*[[Acid Base Balance By The Kidney - Anatomy & Physiology#Secretion of H+ and the Reabsorption of HCO3- in the Proximal Tubule|Link to Article]]</TD>
<TD BGCOLOR="#C1f0f6"><center>N/A</center></TD>
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*Hydrogen is excreted in the collecting ducts both in exchange for potassium and on its own using an ATPase.
*Bicarbonate is reabsorbed.</TD>
<TD BGCOLOR="#C1f0f6"><center>N/A</center></TD>
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<TD BGCOLOR="#C1f0f6">'''H<sup>+</sup> and HCO<sub>3</sub><sup>-</sup>'''</TD>
<TD BGCOLOR="#C1f0f6">'''Organic Acids and Bases'''</TD>
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* The secretion of H<sup>+</sup> in this section of the nephron is mainly a result of the Na<sup>+</sup>/H<sup>+</sup> antiporter in the apical membrane using secondary active transport.
* Secreted here via primary active secretion.
*[[Reabsorption and Secretion Along the Proximal Tubule - Anatomy & Physiology#Primary Active Secretion - Organic Acids and Bases|Link to Article]]</TD>
*[[Acid Base Balance By The Kidney - Anatomy & Physiology#Secretion of H+ and the Reabsorption of HCO3- in the Proximal Tubule|Link to Article]]</TD>
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<TD BGCOLOR="#C1f0f6"><center>N/A</center></TD>
<TD BGCOLOR="#C1f0f6"><center>N/A</center></TD>
<TD BGCOLOR="#C1f0f6"><center>N/A</center></TD>
<TD BGCOLOR="#C1f0f6"><center>N/A</center></TD>
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