Difference between revisions of "Reabsorption and Secretion Along the Nephron Summary Table - Anatomy & Physiology"
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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. | * 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. | ||
*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. | *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. | ||
− | *[[ | + | *[[Reabsorption and Secretion Along the Proximal Tubule - Anatomy & Physiology|Link to Article]]</TD> |
<TD BGCOLOR="#C1f0f6"><center>N/A</center></TD> | <TD BGCOLOR="#C1f0f6"><center>N/A</center></TD> | ||
<TD BGCOLOR="#C1f0f6"> | <TD BGCOLOR="#C1f0f6"> | ||
*Hydrogen is excreted in the collecting ducts both in exchange for potassium and on its own using an ATPase. | *Hydrogen is excreted in the collecting ducts both in exchange for potassium and on its own using an ATPase. | ||
− | *Bicarbonate is reabsorbed.</TD> | + | *Bicarbonate is reabsorbed. |
+ | *[[Reabsorption and Secretion Along the Distal Tubule and Collecting Duct - Anatomy & Physiology#H+ and HCO3-|Link to Article]]</TD> | ||
<TD BGCOLOR="#C1f0f6"><center>N/A</center></TD> | <TD BGCOLOR="#C1f0f6"><center>N/A</center></TD> | ||
</TR> | </TR> |
Revision as of 15:56, 4 September 2008
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Sodium |
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The reabsorption of sodium in the distal tubule is under the influence of two hormones:
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Potassium |
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Aldosterone acts of the sodium/potassium ATPase in the principal cells of the collecting duct increase potassium excretion. |
Urea |
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ADH makes the collecting duct more permeable to Urea |
H+ and HCO3- |
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Glucose |
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Protein |
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Calcium |
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The regulation of how much calcium is reabsorbed occurs in the athe distal tubule and collecting ducts. | Parathyroid hormone stimulates reabsorption. |
Organic Acids and Bases |
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